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#include<stdio.h>

#include<conio.h>

void swap( int *x, int *y )                     // call by refrence

{

    int  t ;

    t = *x ;

    *x = *y ;

    *y = t ;

}

void main( )

{

    int a,b;

    printf("Enter a, b:");

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

    printf("\n Before swap  a:%d, b:%d",a,b);

    swap ( &a, &b ) ; // passing the address of values to be swapped

    printf("\n After  swap  a:%d, b:%d",a,b);

    getch();

}