三种方法交换两个变量的值

#include<stdio.h>

void Swap1(int x, int y)//使用了中间值
{
    int temp;
    temp = x;
    x = y;
    y = temp;
    printf("第一种%d,%d\n",x,y);
}
void Swap2(int x, int y)//未使用中间值
{
    x = x + y;
    y = x - y;
    x = x - y;
    printf("第二种%d,%d\n",x,y);
}
void Swap3(int x, int y)//使用了异或关系（高级）
{
    x = x^y;//相当于x=x-y;
    y = x^y;//相当于y=x+y;
    x = x^y;//相当于x=y-x;
    printf("第三种%d,%d\n",x,y);
}
int main()
{
    int a = 10;
    int b = 20;
    printf("%d,%d\n",a,b);
    printf("交换之后:\n");
    Swap1(a, b);
    Swap2(a, b);
    Swap3(a, b);
    system("pause");
    return 0;
}