给定两个整形变量的值，将两个值的内容进行交换

允许创建临时变量

#include<stdio.h>#pragma warning(disable:4996)#include<Windows.h>int main(){int a = 10;int b = 20;int temp;printf("a=%d,b=%d\n", a, b);temp = a;a = b;b = temp;printf("a=%d,b=%d", a, b);system("pause");return 0;}

不允许创建临时变量

（1）

#include<stdio.h>#pragma warning(disable:4996)#include<Windows.h>int main(){int a = 10;int b = 20;printf("a=%d,b=%d\n", a, b);a = a - b;b = a + b;a = b - a;printf("a=%d,b=%d", a, b);system("pause");return 0;}

（2）

#include<stdio.h>#pragma warning(disable:4996)#include<Windows.h>int main(){int a = 10;int b = 20;printf("a=%d,b=%d\n", a, b);a = a^b;b = a^b;a = a^b;printf("a=%d,b=%d", a, b);system("pause");return 0;}