C program to call a user defined function

In this tutorial, we are going to write a C program to show how a user-defined function is called in C Programming with practical program code and step-by-step full complete explanation.

C program to call a user-defined function.

 
#include<stdio.h>
#include<conio.h>

int add(int,int);
void main()
{
    int x=1,y=2,z;
    z=add(x,y);

    printf("z=%d",z);
}

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

Output

 
z=3