C program to define & call user defined functions

In this tutorial, we are going to write a C program to define the user-defined functions and call them at different places in C Programming with practical program code and step-by-step full complete explanation.

C Program to define & call user-defined functions.

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

void y();

void y()
{
    printf("Y");
}

void main()
{
    void a(), b(), c(), d();

    clrscr();

    y();
    a();
    b();
    c();
    d();
}

void a()
{
    printf("A");
    y();
}

void b()
{
    printf("B");
    a();
}

void c()
{
    a();
    b();
    printf("C");
}

void d()
{
    printf("D");
    c();
    b();
    a();
}

Output

 
YAYBAYAYBAYCDAYBAYCBAYAY