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Test: Strings - 1 - Software Development MCQ

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20 Questions MCQ Test Basics of C++ - Test: Strings - 1

Test: Strings - 1 for Software Development 2024 is part of Basics of C++ preparation. The Test: Strings - 1 questions and answers have been prepared according to the Software Development exam syllabus.The Test: Strings - 1 MCQs are made for Software Development 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Strings - 1 below.

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Test: Strings - 1 - Question 1

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Which header file should be included to work with strings in C++?

A.
iostream
B.
cstring
C.
string
D.
sstream

Detailed Solution for Test: Strings - 1 - Question 1

The string header file (string.h) should be included to work with strings in C++.

Test: Strings - 1 - Question 2

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What is the maximum number of characters that can be stored in a string object in C++?

A.
255
B.
512
C.
1024
D.
Unlimited

Detailed Solution for Test: Strings - 1 - Question 2

In C++, there is no specific limit on the number of characters that can be stored in a string object.

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Test: Strings - 1 - Question 3

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What is the purpose of the 'getline()' function in C++?

A.
It reads a line of text from the console.
B.
It converts a string to lowercase.
C.
It concatenates two strings.
D.
It searches for a substring within a string.

Detailed Solution for Test: Strings - 1 - Question 3

The 'getline()' function is used to read a line of text from the console.

Test: Strings - 1 - Question 4

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Which of the following is a valid way to concatenate two strings in C++?

A.
Using the '+' operator
B.
Using the 'concat()' function
C.
Using the 'append()' function
D.
All of the above

Detailed Solution for Test: Strings - 1 - Question 4

All of the options are valid ways to concatenate two strings in C++.

Test: Strings - 1 - Question 5

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Which function is used to find the length of a string in C++?

A.
length()
B.
size()
C.
strlen()
D.
All of the above

Detailed Solution for Test: Strings - 1 - Question 5

All of the options (length(), size(), and strlen()) can be used to find the length of a string in C++.

Test: Strings - 1 - Question 6

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What does the 'c_str()' function do in C++?

A.
It converts a string to a character array.
B.
It converts a character array to a string.
C.
It compares two strings.
D.
It finds the position of a substring within a string.

Detailed Solution for Test: Strings - 1 - Question 6

The c_str() function is used to convert a string to a character array (C-style string).

Test: Strings - 1 - Question 7

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What is the output of the following code snippet?
string str = "Hello";
cout << str[2];

A.
H
B.
e
C.
l
D.
o

Detailed Solution for Test: Strings - 1 - Question 7

The output will be 'l' because string indexing starts from 0, so str[2] refers to the third character in the string.

Test: Strings - 1 - Question 8

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Which function is used to extract a substring from a string in C++?

A.
substr()
B.
extract()
C.
sub()
D.
slice()

Detailed Solution for Test: Strings - 1 - Question 8

The substr() function is used to extract a substring from a string in C++.

Test: Strings - 1 - Question 9

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What is the return type of the 'find()' function in C++?

A.
int
B.
size_t
C.
bool
D.
string

Detailed Solution for Test: Strings - 1 - Question 9

The find() function returns a value of type size_t, which is an unsigned integer type.

Test: Strings - 1 - Question 10

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Which of the following is not a valid way to compare two strings in C++?

A.
Using the '==' operator
B.
Using the 'compare()' function
C.
Using the 'equals()' function
D.
All of the above

Detailed Solution for Test: Strings - 1 - Question 10

The equals() function is not a valid way to compare two strings in C++.

Test: Strings - 1 - Question 11

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What is the output of the following code snippet?
```cpp
string str1 = "Hello";
string str2 = "World";
cout << str1 + " " + str2;
```

A.
HelloWoorld
B.
Hello World
C.
HelloWorld
D.
Compilation error

Detailed Solution for Test: Strings - 1 - Question 11

The output will be "Hello World" because the + operator can be used to concatenate strings.

Test: Strings - 1 - Question 12

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What is the output of the following code snippet?
```cpp
string str = "OpenAI";
cout << str.substr(2, 3);
```

A.
pen
B.
Open
C.
enA
D.
AI

Detailed Solution for Test: Strings - 1 - Question 12

The output will be "pen" because substr(2, 3) extracts a substring starting from index 2 with a length of 3.

Test: Strings - 1 - Question 13

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What is the output of the following code snippet?

```cpp
string str = "Hello";
str[1] = 'X';
cout << str;
```

A.
Hello
B.
HXllo
C.
Hllo
D.
Compilation error

Detailed Solution for Test: Strings - 1 - Question 13

The output will be "HXllo" because str[1] is replaced with 'X'.

Test: Strings - 1 - Question 14

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What is the output of the following code snippet?
```cpp
string str = "Hello World";
cout << str.find("World");
```

A.
0
B.
5
C.
6
D.
-1

Detailed Solution for Test: Strings - 1 - Question 14

The output will be 6 because the find() function returns the position of the substring "World" within the string.

Test: Strings - 1 - Question 15

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What is the output of the following code snippet?
```cpp
string str = "Programming";
cout << str.size() << " " << str.length();
```

A.
11 11
B.
11 10
C.
10 11
D.
10 10

Detailed Solution for Test: Strings - 1 - Question 15

The output will be "11 11" because size() and length() both return the length of the string.

Test: Strings - 1 - Question 16

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What is the output of the following code snippet?
```cpp
string str = "Hello World";
reverse(str.begin(), str.end());
cout << str;
```

A.
Hello World
B.
dlroW olleH
C.
dlroW Hello
D.
Compilation error

Detailed Solution for Test: Strings - 1 - Question 16

The output will be "dlroW olleH" because the reverse() function is used to reverse the string.

Test: Strings - 1 - Question 17

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What is the output of the following code snippet?
```cpp
string str1 = "Hello";
string str2 = "Hello";
if (str1.compare(str2) == 0)
cout << "Equal";
else
cout << "Not equal";
```

A.
Equal
B.
Not equal
C.
0
D.
1

Detailed Solution for Test: Strings - 1 - Question 17

The output will be "Equal" because the compare() function returns 0 when the strings are equal.

Test: Strings - 1 - Question 18

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What is the output of the following code snippet?
```cpp
string str = "Hello World";
str.erase(5, 5);
cout << str;
```

A.
Hello
B.
World
C.
HelloWorld
D.
Compilation error

Detailed Solution for Test: Strings - 1 - Question 18

The output will be "Hello" because erase(5, 5) removes 5 characters starting from index 5.

Test: Strings - 1 - Question 19

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What is the output of the following code snippet?
```cpp
string str = "Hello World";
str.insert(6, "C++ ");
cout << str;
```

A.
Hello C++ World
B.
World Hello C++
C.
Hello World C++
D.
Compilation error

Detailed Solution for Test: Strings - 1 - Question 19

The output will be "Hello C++ World" because insert(6, "C++ ") inserts the string "C++ " at index 6.

Test: Strings - 1 - Question 20

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What is the output of the following code snippet?
```cpp
string str = "Hello World";
str.replace(6, 5, "C++");
cout << str;
```

A.
Hello C++ld
B.
C++ World
C.
Hello C++
D.
Compilation error

Detailed Solution for Test: Strings - 1 - Question 20

The output will be "Hello C++ld" because replace(6, 5, "C++") replaces 5 characters starting from index 6 with the string "C++".

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