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Which loop construct in Java is most suitable when the number of iterations is unknown?- a)for loop
- b)while loop
- c)do-while loop
- d)switch statement
Correct answer is option 'B'. Can you explain this answer?
Which loop construct in Java is most suitable when the number of iterations is unknown?
a)
for loop
b)
while loop
c)
do-while loop
d)
switch statement
|
Khaled Al Mansoori answered |
While loop is the most suitable loop construct in Java when the number of iterations is unknown.
The while loop in Java is a control flow statement that allows us to repeatedly execute a block of code as long as a given condition is true. It is commonly used when the number of iterations is unknown or not fixed. Here are the reasons why the while loop is the most suitable in such situations:
1. Flexibility:
The while loop provides flexibility as it allows us to execute a block of code based on a condition that can be dynamically evaluated. This means that we can continue looping until a specific condition is met, and the number of iterations can vary depending on the situation.
2. Condition-based:
The while loop is condition-based, meaning it checks the condition before executing the block of code. If the condition is false initially, the loop will not execute at all. This makes it suitable when the number of iterations is unknown, as we can check a condition that determines when to exit the loop.
3. Unknown Iterations:
When the number of iterations is unknown, using a for loop or a do-while loop may not be suitable. A for loop requires a fixed number of iterations, and a do-while loop executes the code block at least once before checking the condition. The while loop, on the other hand, allows us to check the condition before each iteration, making it ideal when the exact number of iterations is uncertain.
4. Dynamic Termination:
The while loop allows for dynamic termination by modifying the condition during the loop execution. This means that we can change the condition within the loop based on certain criteria, allowing us to exit the loop when necessary. This flexibility is crucial when the number of iterations is unknown.
In conclusion, the while loop is the most suitable loop construct in Java when the number of iterations is unknown. Its flexibility, condition-based nature, ability to handle unknown iterations, and dynamic termination make it the preferred choice in such situations.
Explanation:
The while loop in Java is a control flow statement that allows us to repeatedly execute a block of code as long as a given condition is true. It is commonly used when the number of iterations is unknown or not fixed. Here are the reasons why the while loop is the most suitable in such situations:
1. Flexibility:
The while loop provides flexibility as it allows us to execute a block of code based on a condition that can be dynamically evaluated. This means that we can continue looping until a specific condition is met, and the number of iterations can vary depending on the situation.
2. Condition-based:
The while loop is condition-based, meaning it checks the condition before executing the block of code. If the condition is false initially, the loop will not execute at all. This makes it suitable when the number of iterations is unknown, as we can check a condition that determines when to exit the loop.
3. Unknown Iterations:
When the number of iterations is unknown, using a for loop or a do-while loop may not be suitable. A for loop requires a fixed number of iterations, and a do-while loop executes the code block at least once before checking the condition. The while loop, on the other hand, allows us to check the condition before each iteration, making it ideal when the exact number of iterations is uncertain.
4. Dynamic Termination:
The while loop allows for dynamic termination by modifying the condition during the loop execution. This means that we can change the condition within the loop based on certain criteria, allowing us to exit the loop when necessary. This flexibility is crucial when the number of iterations is unknown.
In conclusion, the while loop is the most suitable loop construct in Java when the number of iterations is unknown. Its flexibility, condition-based nature, ability to handle unknown iterations, and dynamic termination make it the preferred choice in such situations.
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What is the output of the following code snippet?
for (int i = 10; i > 0; i -= 2) {
System.out.print(i + " ");
}- a)10 8 6 4 2
- b)2 4 6 8 10
- c)1 3 5 7 9
- d)This code results in an infinite loop
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
for (int i = 10; i > 0; i -= 2) {
System.out.print(i + " ");
}
for (int i = 10; i > 0; i -= 2) {
System.out.print(i + " ");
}
a)
10 8 6 4 2
b)
2 4 6 8 10
c)
1 3 5 7 9
d)
This code results in an infinite loop
|
Sonal Yadav answered |
The for loop initializes 'i' to 10 and iterates as long as 'i' is greater than 0. In each iteration, it prints the value of 'i' and decrements 'i' by 2.
What is the output of the following code snippet?
int i = 5;
while (i > 0) {
System.out.print(i + " ");
i--;
}- a)5 4 3 2 1
- b)1 2 3 4 5
- c)0 1 2 3 4
- d)This code results in an infinite loop
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 5;
while (i > 0) {
System.out.print(i + " ");
i--;
}
int i = 5;
while (i > 0) {
System.out.print(i + " ");
i--;
}
a)
5 4 3 2 1
b)
1 2 3 4 5
c)
0 1 2 3 4
d)
This code results in an infinite loop
|
|
Sonal Yadav answered |
The while loop starts with 'i' initialized to 5 and prints the value of 'i'. It then decrements 'i' by 1 in each iteration until 'i' is no longer greater than 0.
In Java, which loop construct is best suited when the number of iterations is known in advance?- a)for loop
- b)while loop
- c)do-while loop
- d)if-else statement
Correct answer is option 'A'. Can you explain this answer?
In Java, which loop construct is best suited when the number of iterations is known in advance?
a)
for loop
b)
while loop
c)
do-while loop
d)
if-else statement
|
|
Sonal Yadav answered |
The for loop is best suited when the number of iterations is known in advance because it provides a concise way to specify the initialization, condition, and increment/decrement in a single line.
What will be the output of the following code?
```java
int x = 5;
while (x > 0) {
System.out.print(x + " ");
x -= 2;
}
```- a)5 3 1
- b)5 4 3 2 1
- c)5 5 5 5 5
- d)1 3 5
Correct answer is option 'B'. Can you explain this answer?
What will be the output of the following code?
```java
int x = 5;
while (x > 0) {
System.out.print(x + " ");
x -= 2;
}
```
```java
int x = 5;
while (x > 0) {
System.out.print(x + " ");
x -= 2;
}
```
a)
5 3 1
b)
5 4 3 2 1
c)
5 5 5 5 5
d)
1 3 5
|
Talal Al Hashimi answered |
This code snippet is incomplete and will result in a compilation error. The while loop condition is not complete, as it is missing the comparison operator and the value it should be compared to.
To get the desired result, the code should be corrected as follows:
```java
int x = 5;
while (x > 0) {
System.out.println(x);
x--;
}
```
With this correction, the output will be:
```
5
4
3
2
1
```
To get the desired result, the code should be corrected as follows:
```java
int x = 5;
while (x > 0) {
System.out.println(x);
x--;
}
```
With this correction, the output will be:
```
5
4
3
2
1
```
What is the output of the following code snippet?
int sum = 0;
for (int i = 1; i <= 5; i++) {
sum += i;
}
System.out.println(sum);- a)5
- b)10
- c)15
- d)25
Correct answer is option 'B'. Can you explain this answer?
What is the output of the following code snippet?
int sum = 0;
for (int i = 1; i <= 5; i++) {
sum += i;
}
System.out.println(sum);
int sum = 0;
for (int i = 1; i <= 5; i++) {
sum += i;
}
System.out.println(sum);
a)
5
b)
10
c)
15
d)
25
|
Rasha Khalifa Al Gurg answered |
The code snippet is incomplete and the output cannot be determined. The condition for the loop is missing, so it is unclear how many times the loop will iterate. Additionally, there is no code inside the loop that modifies the value of the variable "sum", so the final value of "sum" cannot be determined either.
Which of the following loop constructs is used to iterate over an array in Java?- a)for loop
- b)while loop
- c)do-while loop
- d)switch statement
Correct answer is option 'A'. Can you explain this answer?
Which of the following loop constructs is used to iterate over an array in Java?
a)
for loop
b)
while loop
c)
do-while loop
d)
switch statement
|
|
Sonal Yadav answered |
The for loop is commonly used to iterate over an array in Java.
What is the output of the following code snippet?
int i = 0;
while (i < 5) {
if (i % 2 == 0) {
i++;
continue;
}
System.out.print(i + " ");
i++;
}- a)0 1 2 3 4
- b)1 3
- c)1 3 5
- d)1 3 5 7 9
Correct answer is option 'C'. Can you explain this answer?
What is the output of the following code snippet?
int i = 0;
while (i < 5) {
if (i % 2 == 0) {
i++;
continue;
}
System.out.print(i + " ");
i++;
}
int i = 0;
while (i < 5) {
if (i % 2 == 0) {
i++;
continue;
}
System.out.print(i + " ");
i++;
}
a)
0 1 2 3 4
b)
1 3
c)
1 3 5
d)
1 3 5 7 9
|
|
Sonal Yadav answered |
The while loop starts with 'i' initialized to 0 and increments 'i' by 1 in each iteration. If 'i' is even, it skips the remaining statements using the continue statement. Therefore, only odd values of 'i' are printed.
What is the output of the following code snippet?
int i = 1;
while (i < 5) {
if (i == 3) {
i++;
continue;
}
System.out.print(i + " ");
i++;
}- a)1 2 3 4
- b)1 2 4
- c)1 2 4 5
- d)1 4
Correct answer is option 'B'. Can you explain this answer?
What is the output of the following code snippet?
int i = 1;
while (i < 5) {
if (i == 3) {
i++;
continue;
}
System.out.print(i + " ");
i++;
}
int i = 1;
while (i < 5) {
if (i == 3) {
i++;
continue;
}
System.out.print(i + " ");
i++;
}
a)
1 2 3 4
b)
1 2 4
c)
1 2 4 5
d)
1 4
|
|
Sonal Yadav answered |
The while loop starts with 'i' initialized to 1 and increments 'i' by 1 in each iteration. If 'i' is equal to 3, it skips the remaining statements using the 'continue' statement. Therefore, the number 3 is not printed in the output.
What is the output of the following code snippet?
int i = 10;
do {
System.out.print(i + " ");
i -= 3;
} while (i > 0);- a)10 7 4 1
- b)1 4 7 10
- c)10 8 6 4 2
- d)This code results in an infinite loop
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 10;
do {
System.out.print(i + " ");
i -= 3;
} while (i > 0);
int i = 10;
do {
System.out.print(i + " ");
i -= 3;
} while (i > 0);
a)
10 7 4 1
b)
1 4 7 10
c)
10 8 6 4 2
d)
This code results in an infinite loop
|
|
Salem Al Balushi answered |
There is a syntax error in the code snippet provided. The code is missing a closing parenthesis after the "System.out.print(i" statement. Once the missing parenthesis is added, the code snippet would look like this:
```
int i = 10;
do {
System.out.print(i);
} while (i < />
```
In this case, the output would be "10".
```
int i = 10;
do {
System.out.print(i);
} while (i < />
```
In this case, the output would be "10".
What is the output of the following code snippet?
int i = 1;
while (i <= 3) {
for (int j = 0; j < i; j++) {
System.out.print("*");
}
System.out.println();
i++;
}- a)*
** - b)***
** - c)*
*** - d)***
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 1;
while (i <= 3) {
for (int j = 0; j < i; j++) {
System.out.print("*");
}
System.out.println();
i++;
}
int i = 1;
while (i <= 3) {
for (int j = 0; j < i; j++) {
System.out.print("*");
}
System.out.println();
i++;
}
a)
*
**
**
b)
***
**
**
c)
*
***
***
d)
***
|
|
Saif Al Abdulla answered |
The code you provided is incomplete. The condition of the while loop is missing. Please provide the complete code snippet so that I can determine the output.
Which loop structure is best suited for iterating over an array or a collection?- a)for loop
- b)while loop
- c)do-while loop
- d)nested loop
Correct answer is option 'A'. Can you explain this answer?
Which loop structure is best suited for iterating over an array or a collection?
a)
for loop
b)
while loop
c)
do-while loop
d)
nested loop
|
|
Reema Majid Al Ali answered |
For Loop:
The for loop is the best loop structure for iterating over an array or a collection. It provides a concise and efficient way to loop through the elements of an array or a collection.
Efficiency:
The for loop is more efficient than other loop structures because it allows you to specify the exact number of iterations. This is particularly useful when iterating over an array or a collection with a known length. The loop control variable is typically used to keep track of the current index or position in the array.
Initialization, Condition, and Increment:
The for loop has three components: initialization, condition, and increment. These components are defined within the parentheses after the keyword "for".
- Initialization: This is the initial value of the loop control variable. It is executed only once before the loop starts.
- Condition: This is the condition that is evaluated before each iteration. If the condition is true, the loop continues; otherwise, it exits.
- Increment: This is the operation that is performed at the end of each iteration. It is used to update the loop control variable.
Example:
Here is an example of a for loop that iterates over an array:
```java
int[] numbers = {1, 2, 3, 4, 5};
for (int i = 0; i < numbers.length;="" i++)="" />
System.out.println(numbers[i]);
}
```
In this example, the loop control variable `i` is initialized to 0. The loop continues as long as `i` is less than the length of the array `numbers`. The loop control variable `i` is incremented by 1 after each iteration. The loop prints each element of the array.
Conclusion:
The for loop is the most suitable loop structure for iterating over an array or a collection. It provides efficiency, control, and clarity in looping through the elements. It allows you to specify the exact number of iterations and easily access the elements of the array or collection.
The for loop is the best loop structure for iterating over an array or a collection. It provides a concise and efficient way to loop through the elements of an array or a collection.
Efficiency:
The for loop is more efficient than other loop structures because it allows you to specify the exact number of iterations. This is particularly useful when iterating over an array or a collection with a known length. The loop control variable is typically used to keep track of the current index or position in the array.
Initialization, Condition, and Increment:
The for loop has three components: initialization, condition, and increment. These components are defined within the parentheses after the keyword "for".
- Initialization: This is the initial value of the loop control variable. It is executed only once before the loop starts.
- Condition: This is the condition that is evaluated before each iteration. If the condition is true, the loop continues; otherwise, it exits.
- Increment: This is the operation that is performed at the end of each iteration. It is used to update the loop control variable.
Example:
Here is an example of a for loop that iterates over an array:
```java
int[] numbers = {1, 2, 3, 4, 5};
for (int i = 0; i < numbers.length;="" i++)="" />
System.out.println(numbers[i]);
}
```
In this example, the loop control variable `i` is initialized to 0. The loop continues as long as `i` is less than the length of the array `numbers`. The loop control variable `i` is incremented by 1 after each iteration. The loop prints each element of the array.
Conclusion:
The for loop is the most suitable loop structure for iterating over an array or a collection. It provides efficiency, control, and clarity in looping through the elements. It allows you to specify the exact number of iterations and easily access the elements of the array or collection.
What will be the output of the following code snippet?
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
}- a)0 1 2 3 4
- b)1 2 3 4 5
- c)0 1 2 3
- d)1 2 3 4
Correct answer is option 'A'. Can you explain this answer?
What will be the output of the following code snippet?
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
}
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
}
a)
0 1 2 3 4
b)
1 2 3 4 5
c)
0 1 2 3
d)
1 2 3 4
|
|
Sonal Yadav answered |
The code will print the values of 'i' from 0 to 4 because the condition 'i < 5' is true for those values.
What is the purpose of the 'break' statement in a loop?- a)To terminate the current iteration of the loop
- b)To skip the remaining statements in the loop and move to the next iteration
- c)To terminate the loop entirely
- d)To restart the loop from the beginning
Correct answer is option 'A'. Can you explain this answer?
What is the purpose of the 'break' statement in a loop?
a)
To terminate the current iteration of the loop
b)
To skip the remaining statements in the loop and move to the next iteration
c)
To terminate the loop entirely
d)
To restart the loop from the beginning
|
Mariam Fahim Al Dossari answered |
Explanation:
Terminating the current iteration:
- The purpose of the break statement in a loop is to terminate the current iteration of the loop.
- When the break statement is encountered within a loop, it immediately exits the loop and moves to the code following the loop.
Example:
- For example, in a for loop, if a certain condition is met and you want to stop the loop from running any further, you can use the break statement.
Usage:
- The break statement is commonly used when you want to exit a loop prematurely based on certain conditions.
- It helps in controlling the flow of the loop and allows you to terminate the loop when a specific condition is met.
Other options:
- Option (b) is incorrect as the break statement does not skip the remaining statements in the loop; it only terminates the current iteration.
- Option (c) is incorrect as the break statement does not terminate the loop entirely; it only exits the current iteration.
- Option (d) is incorrect as the break statement does not restart the loop from the beginning; it simply ends the current iteration.
Conclusion:
- In conclusion, the break statement is a useful tool in programming loops as it allows you to control the flow of the loop and exit it when needed. It helps in improving the efficiency and readability of your code by terminating iterations based on specific conditions.
Terminating the current iteration:
- The purpose of the break statement in a loop is to terminate the current iteration of the loop.
- When the break statement is encountered within a loop, it immediately exits the loop and moves to the code following the loop.
Example:
- For example, in a for loop, if a certain condition is met and you want to stop the loop from running any further, you can use the break statement.
Usage:
- The break statement is commonly used when you want to exit a loop prematurely based on certain conditions.
- It helps in controlling the flow of the loop and allows you to terminate the loop when a specific condition is met.
Other options:
- Option (b) is incorrect as the break statement does not skip the remaining statements in the loop; it only terminates the current iteration.
- Option (c) is incorrect as the break statement does not terminate the loop entirely; it only exits the current iteration.
- Option (d) is incorrect as the break statement does not restart the loop from the beginning; it simply ends the current iteration.
Conclusion:
- In conclusion, the break statement is a useful tool in programming loops as it allows you to control the flow of the loop and exit it when needed. It helps in improving the efficiency and readability of your code by terminating iterations based on specific conditions.
What is the output of the following code snippet?
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
}- a)0 1 2 3 4
- b)1 2 3 4 5
- c)0 1 2 3 4 5
- d)This code results in an infinite loop
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
}
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
}
a)
0 1 2 3 4
b)
1 2 3 4 5
c)
0 1 2 3 4 5
d)
This code results in an infinite loop
|
|
Sonal Yadav answered |
The code snippet initializes 'i' to 0 and then enters the while loop. It prints the value of 'i', increments 'i' by 1, and repeats the process until 'i' is no longer less than 5.
What is the purpose of a loop's initialization statement?- a)To define the loop's condition
- b)To increment or decrement the loop counter
- c)To execute the loop's code block
- d)To terminate the loop
Correct answer is option 'B'. Can you explain this answer?
What is the purpose of a loop's initialization statement?
a)
To define the loop's condition
b)
To increment or decrement the loop counter
c)
To execute the loop's code block
d)
To terminate the loop
|
|
Sonal Yadav answered |
The initialization statement in a loop is used to initialize or set the loop counter and is typically used to increment or decrement the counter variable.
Which loop structure in Java allows the code block to be executed at least once, even if the condition is false initially?- a)for loop
- b)while loop
- c)do-while loop
- d)nested loop
Correct answer is option 'C'. Can you explain this answer?
Which loop structure in Java allows the code block to be executed at least once, even if the condition is false initially?
a)
for loop
b)
while loop
c)
do-while loop
d)
nested loop
|
|
Sonal Yadav answered |
The do-while loop structure executes the code block at least once, even if the condition is false initially.
What will be the output of the following code snippet?
int i = 10;
do {
System.out.print(i + " ");
i--;
} while (i > 0);- a)10 9 8 7 6 5 4 3 2 1
- b)10 9 8 7 6 5 4 3 2
- c)9 8 7 6 5 4 3 2 1
- d)10
Correct answer is option 'A'. Can you explain this answer?
What will be the output of the following code snippet?
int i = 10;
do {
System.out.print(i + " ");
i--;
} while (i > 0);
int i = 10;
do {
System.out.print(i + " ");
i--;
} while (i > 0);
a)
10 9 8 7 6 5 4 3 2 1
b)
10 9 8 7 6 5 4 3 2
c)
9 8 7 6 5 4 3 2 1
d)
10
|
|
Sonal Yadav answered |
The code will print the values of 'i' from 10 to 1 because the condition 'i > 0' is true for those values.
What is the output of the following code snippet?
int i = 2;
while (i <= 6) {
System.out.print(i + " ");
i += 2;
}- a)2 4 6
- b)2 4 6 8
- c)2 3 4 5 6
- d)4 6 8
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 2;
while (i <= 6) {
System.out.print(i + " ");
i += 2;
}
int i = 2;
while (i <= 6) {
System.out.print(i + " ");
i += 2;
}
a)
2 4 6
b)
2 4 6 8
c)
2 3 4 5 6
d)
4 6 8
|
|
Sonal Yadav answered |
The while loop starts with 'i' initialized to 2 and increments 'i' by 2 in each iteration. It prints the value of 'i' in each iteration until 'i' is no longer less than or equal to 6.
What is the output of the following code snippet?
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
if (i == 3) {
break;
}
}- a)0 1 2
- b)0 1 2 3 4
- c)0 1
- d)0 1 3 4
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
if (i == 3) {
break;
}
}
int i = 0;
while (i < 5) {
System.out.print(i + " ");
i++;
if (i == 3) {
break;
}
}
a)
0 1 2
b)
0 1 2 3 4
c)
0 1
d)
0 1 3 4
|
|
Sonal Yadav answered |
The while loop starts with 'i' initialized to 0 and prints the value of 'i'. It then increments 'i' by 1 in each iteration. However, when 'i' becomes 3, the break statement is encountered, which terminates the loop.
What will be the output of the following code?
```java
int i = 10;
while (i > 5) {
i--;
}
System.out.print(i);
```- a)10
- b)5
- c)6
- d)4
Correct answer is option 'B'. Can you explain this answer?
What will be the output of the following code?
```java
int i = 10;
while (i > 5) {
i--;
}
System.out.print(i);
```
```java
int i = 10;
while (i > 5) {
i--;
}
System.out.print(i);
```
a)
10
b)
5
c)
6
d)
4
|
|
Sonal Yadav answered |
The code starts with 'i' as 10 and continues decrementing it until it becomes 5. The loop terminates when 'i' becomes 5, and the value of 'i' is printed.
What is the condition in a do-while loop?- a)It is optional and not required.
- b)It is specified after the keyword "do."
- c)It is specified before the keyword "do."
- d)It is not required in a do-while loop.
Correct answer is option 'B'. Can you explain this answer?
What is the condition in a do-while loop?
a)
It is optional and not required.
b)
It is specified after the keyword "do."
c)
It is specified before the keyword "do."
d)
It is not required in a do-while loop.
|
|
Sonal Yadav answered |
The condition in a do-while loop is specified after the keyword "do."
What is the output of the following code snippet?
int i = 0;
while (i < 3) {
int j = 0;
while (j < 2) {
System.out.print(i + "" + j + " ");
j++;
}
i++;
}- a)00 01 10 11 20 21
- b)00 10 20 01 11 21
- c)00 01 11 02 12 22
- d)00 01 10 11 12 20 21 22
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 0;
while (i < 3) {
int j = 0;
while (j < 2) {
System.out.print(i + "" + j + " ");
j++;
}
i++;
}
int i = 0;
while (i < 3) {
int j = 0;
while (j < 2) {
System.out.print(i + "" + j + " ");
j++;
}
i++;
}
a)
00 01 10 11 20 21
b)
00 10 20 01 11 21
c)
00 01 11 02 12 22
d)
00 01 10 11 12 20 21 22
|
|
Sonal Yadav answered |
The outer while loop initializes 'i' to 0 and increments 'i' by 1 in each iteration. The inner while loop initializes 'j' to 0 and increments 'j' by 1 in each iteration. The combination of 'i' and 'j' is printed in each iteration of the inner loop.
What will be the output of the following code?
```java
int i = 0;
int sum = 0;
while (i < 5) {
sum += i;
i++;
}
System.out.print(sum);
```- a)0
- b)5
- c)10
- d)15
Correct answer is option 'C'. Can you explain this answer?
What will be the output of the following code?
```java
int i = 0;
int sum = 0;
while (i < 5) {
sum += i;
i++;
}
System.out.print(sum);
```
```java
int i = 0;
int sum = 0;
while (i < 5) {
sum += i;
i++;
}
System.out.print(sum);
```
a)
0
b)
5
c)
10
d)
15
|
|
Sonal Yadav answered |
The code initializes 'i' as 0 and calculates the sum of 'i' in each iteration until 'i' becomes 5. The final sum will be 0 + 1 + 2 + 3 + 4 = 10.
What will be the output of the following code?
```java
int x = 5;
do {
System.out.print(x + " ");
x++;
} while (x < 10);
```- a)5 6 7 8 9
- b)6 7 8 9 10
- c)5 6 7 8 9 10
- d)6 7 8 9
Correct answer is option 'A'. Can you explain this answer?
What will be the output of the following code?
```java
int x = 5;
do {
System.out.print(x + " ");
x++;
} while (x < 10);
```
```java
int x = 5;
do {
System.out.print(x + " ");
x++;
} while (x < 10);
```
a)
5 6 7 8 9
b)
6 7 8 9 10
c)
5 6 7 8 9 10
d)
6 7 8 9
|
|
Sonal Yadav answered |
The code starts with 'x' as 5 and prints its value in each iteration while incrementing it by 1. The loop terminates when 'x' becomes 10, and the condition becomes false.
What is the output of the following code snippet?
int i = 0;
do {
System.out.print(i + " ");
i++;
} while (i < 5);- a)0 1 2 3 4
- b)1 2 3 4 5
- c)0 1 2 3 4 5
- d)This code results in an infinite loop
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 0;
do {
System.out.print(i + " ");
i++;
} while (i < 5);
int i = 0;
do {
System.out.print(i + " ");
i++;
} while (i < 5);
a)
0 1 2 3 4
b)
1 2 3 4 5
c)
0 1 2 3 4 5
d)
This code results in an infinite loop
|
|
Sonal Yadav answered |
The do-while loop structure executes the code block first and then checks the condition. In this case, the code block is executed as long as 'i' is less than 5. It prints the value of 'i' and increments 'i' by 1.
What is the initial condition in a while loop?- a)It is optional and not required.
- b)It is specified after the keyword "while."
- c)It is specified before the keyword "while."
- d)It is not required in a while loop.
Correct answer is option 'B'. Can you explain this answer?
What is the initial condition in a while loop?
a)
It is optional and not required.
b)
It is specified after the keyword "while."
c)
It is specified before the keyword "while."
d)
It is not required in a while loop.
|
|
Sonal Yadav answered |
The initial condition in a while loop is specified after the keyword "while."
What will be the output of the following code?
```java
int i = 0;
do {
System.out.print(i + " ");
i += 2;
} while (i <= 5);
```- a)0 1 2 3 4 5
- b)0 2 4 6
- c)0 2 4
- d)2 4
Correct answer is option 'C'. Can you explain this answer?
What will be the output of the following code?
```java
int i = 0;
do {
System.out.print(i + " ");
i += 2;
} while (i <= 5);
```
```java
int i = 0;
do {
System.out.print(i + " ");
i += 2;
} while (i <= 5);
```
a)
0 1 2 3 4 5
b)
0 2 4 6
c)
0 2 4
d)
2 4
|
|
Sonal Yadav answered |
The code initializes 'i' as 0 and prints its value in each iteration while incrementing it by 2. The loop terminates when 'i' becomes 6, and the condition becomes false.
What will be the output of the following code?
```java
int i = 5;
while (i > 0) {
System.out.print(i + " ");
i -= 2;
}
```- a)5 3 1
- b)5 4 3 2 1
- c)1 3 5
- d)5
Correct answer is option 'A'. Can you explain this answer?
What will be the output of the following code?
```java
int i = 5;
while (i > 0) {
System.out.print(i + " ");
i -= 2;
}
```
```java
int i = 5;
while (i > 0) {
System.out.print(i + " ");
i -= 2;
}
```
a)
5 3 1
b)
5 4 3 2 1
c)
1 3 5
d)
5
|
|
Sonal Yadav answered |
The code initializes 'i' as 5 and prints its value in each iteration while decrementing it by 2. The loop terminates when 'i' becomes 1.
What will be the output of the following code?
```java
int i = 5;
do {
i--;
} while (i > 0);
System.out.print(i);
```- a)5
- b)4
- c)0
- d)-1
Correct answer is option 'C'. Can you explain this answer?
What will be the output of the following code?
```java
int i = 5;
do {
i--;
} while (i > 0);
System.out.print(i);
```
```java
int i = 5;
do {
i--;
} while (i > 0);
System.out.print(i);
```
a)
5
b)
4
c)
0
d)
-1
|
|
Sonal Yadav answered |
The code initializes 'i' as 5 and continues decrementing it until it becomes 0. The loop terminates when 'i' becomes 0, and the value of 'i' is printed.
What will be the output of the following code?
```java
int i = 0;
do {
System.out.print(i + " ");
i++;
} while (i < 5);
```- a)0 1 2 3 4
- b)1 2 3 4 5
- c)0 1 2 3
- d)1 2 3 4
Correct answer is option 'A'. Can you explain this answer?
What will be the output of the following code?
```java
int i = 0;
do {
System.out.print(i + " ");
i++;
} while (i < 5);
```
```java
int i = 0;
do {
System.out.print(i + " ");
i++;
} while (i < 5);
```
a)
0 1 2 3 4
b)
1 2 3 4 5
c)
0 1 2 3
d)
1 2 3 4
|
|
Sonal Yadav answered |
The code prints the values of 'i' from 0 to 4 because the condition 'i < 5' is true for those values.
What is the output of the following code snippet?
int i = 0;
do {
System.out.print(i + " ");
i += 2;
} while (i < 5);- a)0 2 4
- b)2 4 6
- c)0 1 2 3 4
- d)This code results in an infinite loop
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int i = 0;
do {
System.out.print(i + " ");
i += 2;
} while (i < 5);
int i = 0;
do {
System.out.print(i + " ");
i += 2;
} while (i < 5);
a)
0 2 4
b)
2 4 6
c)
0 1 2 3 4
d)
This code results in an infinite loop
|
|
Sonal Yadav answered |
The do-while loop initializes 'i' to 0 and iterates as long as 'i' is less than 5. In each iteration, it prints the value of 'i' and increments 'i' by 2.
Which of the following statements best describes the need for loops in Java?- a)Loops are used to execute a block of code only once.
- b)Loops are used to execute a block of code repeatedly based on a condition.
- c)Loops are used to execute a block of code without any condition.
- d)Loops are used to execute a block of code in a random order.
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements best describes the need for loops in Java?
a)
Loops are used to execute a block of code only once.
b)
Loops are used to execute a block of code repeatedly based on a condition.
c)
Loops are used to execute a block of code without any condition.
d)
Loops are used to execute a block of code in a random order.
|
|
Sonal Yadav answered |
Loops are used when we want to repeat a block of code multiple times until a certain condition is met.
What is the purpose of the 'continue' statement in a loop?- a)To terminate the loop entirely
- b)To skip the remaining statements in the loop and move to the next iteration
- c)To restart the loop from the beginning
- d)To skip a specific number of iterations in the loop
Correct answer is option 'B'. Can you explain this answer?
What is the purpose of the 'continue' statement in a loop?
a)
To terminate the loop entirely
b)
To skip the remaining statements in the loop and move to the next iteration
c)
To restart the loop from the beginning
d)
To skip a specific number of iterations in the loop
|
|
Sonal Yadav answered |
The 'continue' statement is used to skip the remaining statements in a loop and move to the next iteration, without terminating the loop entirely.
Which loop construct guarantees that the loop body will be executed at least once?- a)for loop
- b)while loop
- c)do-while loop
- d)if-else statement
Correct answer is option 'C'. Can you explain this answer?
Which loop construct guarantees that the loop body will be executed at least once?
a)
for loop
b)
while loop
c)
do-while loop
d)
if-else statement
|
|
Sonal Yadav answered |
The do-while loop guarantees that the loop body will be executed at least once because the condition is checked at the end of the loop.
Which loop construct allows the loop body to be executed at least once?- a)for loop
- b)while loop
- c)do-while loop
- d)switch statement
Correct answer is option 'C'. Can you explain this answer?
Which loop construct allows the loop body to be executed at least once?
a)
for loop
b)
while loop
c)
do-while loop
d)
switch statement
|
|
Sonal Yadav answered |
The do-while loop allows the loop body to be executed at least once because the condition is checked at the end of the loop.
What is the output of the following code snippet?
int x = 3;
while (x > 0) {
System.out.print(x + " ");
x--;
}- a)3 2 1
- b)1 2 3
- c)0 1 2
- d)1 1 1
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
int x = 3;
while (x > 0) {
System.out.print(x + " ");
x--;
}
int x = 3;
while (x > 0) {
System.out.print(x + " ");
x--;
}
a)
3 2 1
b)
1 2 3
c)
0 1 2
d)
1 1 1
|
|
Sonal Yadav answered |
The while loop starts with 'x' initialized to 3 and prints the value of 'x'. It then decrements 'x' by 1 in each iteration until 'x' is no longer greater than 0.
What will be the output of the following code?
```java
int n = 3;
int i = 0;
do {
System.out.print(n + " ");
n--;
i++;
} while (i < n);
```- a)3 2 1
- b)3 2
- c)3 1
- d)3
Correct answer is option 'A'. Can you explain this answer?
What will be the output of the following code?
```java
int n = 3;
int i = 0;
do {
System.out.print(n + " ");
n--;
i++;
} while (i < n);
```
```java
int n = 3;
int i = 0;
do {
System.out.print(n + " ");
n--;
i++;
} while (i < n);
```
a)
3 2 1
b)
3 2
c)
3 1
d)
3
|
|
Sonal Yadav answered |
The code prints the values of 'n' from 3 to 1 because the condition 'i < n' is true for those values. The loop terminates when 'i' becomes 3, and the condition becomes false.
Which loop structure is best suited when the number of iterations is known in advance?- a)for loop
- b)while loop
- c)do-while loop
- d)nested loop
Correct answer is option 'A'. Can you explain this answer?
Which loop structure is best suited when the number of iterations is known in advance?
a)
for loop
b)
while loop
c)
do-while loop
d)
nested loop
|
|
Sonal Yadav answered |
The for loop structure is best suited when the number of iterations is known in advance because it allows you to define the initialization, condition, and update statements in a single line.
What will be the output of the following code?
```java
int i = 1;
int sum = 0;
while (i <= 10) {
sum += i;
i++;
}
System.out.print(sum);
```- a)45
- b)55
- c)50
- d)10
Correct answer is option 'A'. Can you explain this answer?
What will be the output of the following code?
```java
int i = 1;
int sum = 0;
while (i <= 10) {
sum += i;
i++;
}
System.out.print(sum);
```
```java
int i = 1;
int sum = 0;
while (i <= 10) {
sum += i;
i++;
}
System.out.print(sum);
```
a)
45
b)
55
c)
50
d)
10
|
|
Sonal Yadav answered |
The code initializes 'i' as 1 and calculates the sum of 'i' from 1 to 10 using the compound assignment operator '+='. The final sum will be 1 + 2 + 3 + ... + 10 = 55.
Chapter doubts & questions for Loops - Basics of Java 2024 is part of Software Development exam preparation. The chapters have been prepared according to the Software Development exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Software Development 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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