What is void ?

It is also a data type that has no values. In other word it is a null data type. The void is mainly used for non-return type functions.
It is also a keyword and primary or inbuilt data type. It is also play the role of generic type meaning that it can represent any of the other standard types.

Syntax:

     void Function_name();

Ex:

     void calculate();

program: Create a non-return type function to add two number.

#include<stdio.h>

#include<conio.h.>

void calculate(int x, int y); //non-return type function with

//two arguments

void main() // non-return type main() function

{

     int a, b;

     printf(“Enter Two Values : “);

     scanf(“%d%d”, &a, &b);

     calculate(a,b); //calling calculate function

     getch();

}

void calculate(int x, int y)

{

     int sum;

     sum = x + y;

     printf(“Sum = %d”, sum);

}

Output:

     Enter Two Values : 20 15

     Sum = 35