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Which of the following is a valid way to declare a constant variable in C++?
- a)'int const x = 5';
- b)'const int x = 5';
- c)'constant x = 5';
- d)'x = 5; const';
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is a valid way to declare a constant variable i...
A constant variable is declared using the 'const' keyword before the data type.
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Which of the following is a valid way to declare a constant variable i...
Explanation:
In C programming language, a constant variable is a variable whose value cannot be changed once it is assigned. There are several ways to declare a constant variable, but the valid way to declare a constant variable in C is using the keyword "const" before the data type.
The correct option is "const int x = 5;". Here's a detailed explanation of each option and why the correct option is valid:
a) int const x = 5;
This option also declares a constant variable, but it is not the preferred way to declare constants in C. It is valid syntax, but it is not commonly used in C programming.
b) const int x = 5;
This is the correct and preferred way to declare a constant variable in C. It follows the standard convention of placing the "const" keyword before the data type. The variable "x" is declared as an integer constant with the value 5.
c) constant x = 5;
This option is not a valid way to declare a constant variable in C. The keyword "constant" does not exist in the C programming language. The correct keyword to declare a constant variable is "const".
d) x = 5; const;
This option is invalid because it does not declare the variable "x" as a constant. It assigns a value of 5 to the variable "x" and then tries to use the keyword "const" after the assignment, which is not syntactically correct.
In summary, the correct way to declare a constant variable in C is by using the "const" keyword before the data type, as shown in option b: const int x = 5.
In C programming language, a constant variable is a variable whose value cannot be changed once it is assigned. There are several ways to declare a constant variable, but the valid way to declare a constant variable in C is using the keyword "const" before the data type.
The correct option is "const int x = 5;". Here's a detailed explanation of each option and why the correct option is valid:
a) int const x = 5;
This option also declares a constant variable, but it is not the preferred way to declare constants in C. It is valid syntax, but it is not commonly used in C programming.
b) const int x = 5;
This is the correct and preferred way to declare a constant variable in C. It follows the standard convention of placing the "const" keyword before the data type. The variable "x" is declared as an integer constant with the value 5.
c) constant x = 5;
This option is not a valid way to declare a constant variable in C. The keyword "constant" does not exist in the C programming language. The correct keyword to declare a constant variable is "const".
d) x = 5; const;
This option is invalid because it does not declare the variable "x" as a constant. It assigns a value of 5 to the variable "x" and then tries to use the keyword "const" after the assignment, which is not syntactically correct.
In summary, the correct way to declare a constant variable in C is by using the "const" keyword before the data type, as shown in option b: const int x = 5.
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Which of the following is a valid way to declare a constant variable in C++?a)int const x = 5;b)const int x = 5;c)constant x = 5;d)x = 5; const;Correct answer is option 'B'. Can you explain this answer?
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