指针函数完成两个数交换

#include<stdio.h>void swap(int *x,int *y){    int t;    t=*x;    *x=*y;    *y=t;}main(){    int a,b;    int *p1,*p2;    printf("请输入两个整数a,b: ");    scanf("%d%d",&a,&b);    p1=&a;    p2=&b;    swap(p1,p2);    printf("a=%d,b=%d\n",a,b);    return 0;}