C program to swap values of two variables using function (call by reference).

#include<stdio.h>

#include<conio.h>

void main(){

int a,b;

void swap(int*,int*);

clrscr();

printf("Enter two integer numbers\n");

scanf("%d%d",&a,&b);

printf("Before swapping A=%d and B=%d\n",a,b);

swap(&a,&b);

printf("After swapping A=%d and B=%d\n",a,b);

getch();

}

void swap(int *x,int *y){

int z;

z=*x;

*x=*y;

*y=z;

return;

}