#include<stdio.h>

void swap (int *a, int *b);

int main() {
    int x=3,y=5;
    swap(&x ,&y);
    printf("x = %d & y = %d \n", x , y);
    return 0;
}

void swap (int *a, int *b){
    int t= *a;
    *a= *b;
    *b=t;
   // printf("*a= %d & *b= %d \n", a ,b);
}