关于两个变量交换的几种方法。

一、借助第三个变量

#include <stdio.h>#include <stdlib.h>int main(){int a = 2, b = 8;a = a + b;b = a - b;a = a - b;printf("a=%d  b=%d\n", a, b);system("pause");return 0;}

二，运用函数

#include <stdio.h>#include <stdlib.h>void swap(int *pa, int *pb){int tem = 0;tem = *pa;*pa = *pb;*pb = tem;}int main(){int a = 2;int b = 8;swap(&a, &b);printf("a=%d  b=%d\n",a, b);system("pause");return 0;}

三、不借助第三个变量、

1、

#include <stdio.h>#include <stdlib.h>int main(){int a = 2, b = 8;a = a + b;b = a - b;a = a - b;printf("a=%d  b=%d\n", a, b);system("pause");return 0;}

2、

#include <stdio.h>#include <stdlib.h>int main(){int a = 2;int b = 8;a = a^b;b = a^b;a = a^b;printf("a=%d  b=%d\n", a, b);system("pause");return 0;}