c语言变量的交换

#include<stdio.h>
void swap1(int a,int b);    //利用异或交换变量的值,值传递
void swap2(int* a,int* b);    //利用异或交换变量的值,地址传递，这里用指针*


void swap1(int a,int b)    /*深拷贝值传递*/
{
    a = a ^ b;
    b = a ^ b;
    a = a ^ b;
}

void swap2(int* a,int* b)    /*浅拷贝地址传递*/
{
    *a = *a ^ *b;
    *b = *a ^ *b;
    *a = *a ^ *b;
}

int main(void)
{
    int a1 = 5,b1 = 10;
    printf("swap1交换前：地址：a1 = %p,b1 = %p..值：a1 = %d,b1 = %d
",a1,b1,a1,b1);
    swap1(a1,b1);
    printf("swap1交换后：地址：a1 = %p,b1 = %p..值：a1 = %d,b1 = %d
",a1,b1,a1,b1);
    int a2 = 5,b2 = 10;
    printf("swap2交换前：地址：a2 = %p,b2 = %p..值：a2 = %d,b2 = %d
",a2,b2,a2,b2);
    swap2(&a2,&b2);
    printf("swap2交换后：地址：a2 = %p,b2 = %p..值：a2 = %d,b2 = %d
",a2,b2,a2,b2);
    return 0;
}