#include<stdio.h>

int main()

{

   //交换两个数的值

  // 方法一 可读性最好

    int a = ;

    int b = ;

    int temp ;

    temp = a;

    a = b;

    b = temp;

    printf("a = %d, b = %d\n",a, b);

  //方法二

    int c = ;

    int d = ;

    c = d - c;

    d = d - c;

    c = d + c;

    printf("c = %d, d = %d\n",c, d);

 // 方法三

    int e = ;

    int f = ;

    e = e ^ f;

    f = e ^ f;

    e = e ^ f;

    printf("e = %d, f = %d\n",e, f);

   return ;

}

a = , b =

c = , d =

e = , f =