Top C Interview Questions

26. Define functions in C?

In general terms, a function is also called a subroutine in some other languages like php, python and so on. Function is a self contained block of code that performs a specific task. A programmer define a function using its predefined syntax, a programmer can then call that function from elsewhere in your program. Refer For More C Functions

27. Why use functions in C?

28. How functions works in a C program?

Program think of a function as a black box. The code that calls a function doesn't need to know what's inside the function, it just uses the function to get the job done.

#include <stdio.h>
int add(int, int );     //function declaration
int main()
{
//main function definition
int a = 5, b = 10;
int sum;
printf("The value of a and b : %d %d ", a, b);
sum = add(a, b);    //function call
printf("\nsum = %d ", sum);
}
// function definition
int add(int a, int b)
{
int c;
c = a + b;
return c;    //returns a integer value to the calling function
}

29. What is function return type?

The return type is the data type of the value which is given back to the calling function.

30. What is arguments or parameters in C?

C allows programmers to pass information to the called function from the calling function by using parameters. These parameters are variables of data type.

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