Functions and Recursion in C Quiz

Which of the following is the correct syntax for a function declaration in C?

• `int myFunction[] { }`

• `int myFunction(int a, int b);`

• `function myFunction(int a, int b);`

• `declare int myFunction(int a, int b);`

What is the purpose of a function prototype (declaration) in C?

• To allocate memory for the function

• To define the body of the function

• To inform the compiler about the function's name, return type, and parameters before its actual definition

• To call the function from the main program

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

• `int add(int a, int b) { return a + b; }`

• `int add(int a, int b);`

• `add(int a, int b) -> int { return a + b; }`

• `function int add(a, b) { return a + b; }`

What is the return type of a function that does not return any value in C?

• `null`

• `int`

• `void`

• `empty`

What will be the output of the following C code? ```c int square(int x) { return x * x; } int main() { printf("%d", square(5)); return 0; } ```

• 10

• 25

• 55

• Compilation Error

In C, what happens if a function is called before its declaration or definition?

• The program runs normally without any issues

• The compiler may generate a warning or error due to implicit declaration

• The function is automatically declared by the linker

• The program skips the function call

Which of the following correctly describes recursion in C?

• A function that calls another function repeatedly

• A function that calls itself directly or indirectly to solve a problem

• A loop that repeats a block of code multiple times

• A function that returns multiple values

What is the essential requirement for a recursive function to avoid infinite recursion?

• The function must have multiple parameters

• The function must use global variables

• The function must have a base case that terminates the recursion

• The function must return a pointer

What will be the output of the following recursive function when called as `factorial(4)`? ```c int factorial(int n) { if (n == 0) return 1; return n * factorial(n - 1); } ```

• 12

• 16

• 24

• 48

• `int fact(int n) { return n * fact(n); }`

• `int fact(int n) { if(n == 0) return 0; return n * fact(n-1); }`

• `int fact(int n) { if(n == 0) return 1; return n * fact(n-1); }`

• `int fact(int n) { if(n == 1) return n; return n + fact(n-1); }`