C Programming - MCQ Practice Questions

What is the return type of a function that performs an action but doesn't return any value?

In C, what happens when a function is called before its declaration?

Which of the following is an example of call by value in C?

What is the main difference between function declaration and function definition?

Consider the code: int calculate(int a, int b = 5) { return a + b; }. What is the issue?

What will be the output of this recursive function? int fact(int n) { if(n <= 1) return 1; return n * fact(n-1); } fact(5)

Which statement about function parameters passed as arrays is correct?

What is the purpose of the 'extern' keyword when used with a function?

Consider: void modify(int *ptr) { *ptr = 20; } int main() { int x = 10; modify(&x); printf("%d", x); }. Output?

What does variadic function mean in C?

Which of the following correctly demonstrates inline function usage for optimization?

What will happen if a recursive function has no base case?

Consider mutual recursion: void funcA(int n); void funcB(int n); funcA calls funcB and vice versa. What is required?

What is the correct way to return multiple values from a function in C?

Analyze: int (*funcPtr)(int, int); What does this declaration represent?

What is the output of this code? void swap(int a, int b) { int temp = a; a = b; b = temp; } int main() { int x = 5, y = 10; swap(x, y); printf("%d %d", x, y); }

In C99 standard, what is true about function declarations at block scope?

Which approach is more efficient for passing large structures to functions?

What is the primary purpose of function prototypes in C?

Which of the following is a valid function declaration in C?