C program to use global variables on different functions

In this tutorial, we are going to write a C program to show the effect of global variables on different functions in C programming with practical program code and step-by-step full complete explanation.

C program to use global variables on different functions.

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

int b=10, c=5;

void fun();
void main()
{
    printf("In main () B=%d C=%d\n",b,c);

    fun();

    b++;
    c--;

    printf("Again In main() B=%d C=%d\n",b,c);
}

void fun()
{
    b++;
    c--;
    printf("In fun() B=%d C=%d\n",b,c);
}

Output

 
In main() B=10 C=5
In fun() B=11 C=4
Again In main() B=12 C=3