Function in C Language - Quiz

Q: What is the return type of a function in C?

A. void
B. int
C. char
D. Both A and B and C

Correct Option: D
Explanation:

Answer: D) Both A and B.

A function in C can have either a return type of void or an integer type (int, char, short, long, etc.) or a pointer type.

Q: Which of the following is true about function arguments in C language?

A. Function arguments are always passed by value.
B. Function arguments are always passed by reference.
C. Function arguments can be passed by value or by reference.
D. Function arguments can be passed by value, bot not by reference

Correct Option: C
Explanation:

Answer: c. Function arguments can be passed by value or by reference.

Explanation: In C language, function arguments can be passed by value or by reference. When an argument is passed by value, a copy of the argument value is passed to the function. When an argument is passed by reference, a reference to the argument variable is passed to the function.

Q: What will be the output of the following program?

main();
{
static int var = 4 ;
printf("%d", var--);
  
   if(var)
     main();
}

A. 4444........until stack overflow
B. 4321
C. Compiler error
D. Linker Error

Correct Option: B
Explanation: 4321

Q: What is a recursive function in C?

A. A function that calls another function
B. A function that returns a pointer to another function
C. A function that calls itself
D. A function that takes no arguments

Correct Option: D
Explanation:

Answer: C) A function that calls itself. A recursive function is a function that calls itself either directly or indirectly. It is useful for solving problems that can be broken down into smaller sub-problems that are identical or similar in nature to the original problem.

Q: The function sprintf() works like printf(), but operates on ..........

A. Data file
B. stderr
C. string
D. stdin

Correct Option: C
Explanation: string

Q: What is a function prototype in C?

A. A function that takes no arguments
B. A declaration of a function that specifies the function's name, return type, and parameter types
C. A function that returns a pointer to another function
D. A function that has a variable number of arguments

Correct Option: B
Explanation:

Answer: B) A declaration of a function that specifies the function's name, return type, and parameter types. A function prototype is a declaration of a function that appears before the function is defined or called. It specifies the function's name, return type, and parameter types.

Q: What is the purpose of a function prototype in C language?

A. To define the implementation of a function.
B. To declare the return type of a function.
C. To declare the function name and its parameter types.
D. To declare the function name and its return type.

Correct Option: C
Explanation:

Answer: c. To declare the function name and its parameter types.

Explanation: A function prototype is a declaration of the function name and its parameter types, but not its implementation or return type. It allows the compiler to know about the function before it is called, so that it can perform type checking and generate appropriate code.

Q: Which of the following is not a valid data type for function return value in C language?

A. int
B. void
C. float
D. buit

Correct Option: D
Explanation:

Answer: d. buit

Explanation: In C language, a function can return any data type including int, void, float, double, char, pointers, structures, and unions. However, buit is not a valid data type for function return value.

Q: What is the difference between call by value and call by reference in C language?

A. Call by value passes the address of the argument to the function, while call by reference passes a copy of the argument value.
B. Call by value passes a copy of the argument value to the function, while call by reference passes a reference to the argument variable.
C. Call by value and call by reference are the same thing.
D. Call by value passes a reference to the argument variable, while call by reference passes a copy of the argument value.

Correct Option: B
Explanation:

Answer: b. Call by value passes a copy of the argument value to the function, while call by reference passes a reference to the argument variable.

Explanation: In call by value, a copy of the argument value is passed to the function, while in call by reference, a reference to the argument variable is passed to the function. Call by reference allows the function to modify the argument variable, while call by value does not.

Q: Which of the following is true about recursive functions in C language?

A. A recursive function cannot call itself.
B. A recursive function must have a base case to terminate the recursion.
C. A recursive function must have a return type of void.
D. A recursive function cannot be called from another function.

Correct Option: B
Explanation:

Answer: b. A recursive function must have a base case to terminate the recursion.

Explanation: A recursive function is a function that calls itself. To prevent infinite recursion, a recursive function must have a base case that terminates the recursion. The base case is a condition that is tested at each recursive call to determine whether the recursion should continue or terminate.

Function in C Language - Quiz

What is the return type of a function in C?

Which of the following is true about function arguments in C language?

What will be the output of the following program? main(); { static int var = 4 ; printf("%d", var--); if(var) main(); }

What is a recursive function in C?

The function sprintf() works like printf(), but operates on ..........

What is a function prototype in C?

What is the purpose of a function prototype in C language?

Which of the following is not a valid data type for function return value in C language?

What is the difference between call by value and call by reference in C language?

Which of the following is true about recursive functions in C language?

What will be the output of the following program?
main(); { static int var = 4 ; printf("%d", var--); if(var) main(); }