include<stdio.h>

Swap(int &x,int *y)
{
 int c; 
 c=x,x=*y,*y=c;
 return 0;
}
main ()
{
 int a,b;
 scanf("%d%d",&a,&b);
 printf("the first value:a=%d,b=%d\n",a,b);
 Swap(a,&b);
 printf("after swap value:a=%d,b=%d\n",a,b);
 return 0;
}