不借助第三者实现两个变量的交换（java&&C）

1.原理：a^b^b = a

2.实现

java：

package javaPractice;

import java.util.*;

public class Exchange {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();

		a = a^b;
		b = a^b;
		a = a^b;

		System.out.println("交换后的值为a和b分别为"+a+","+b);
	}
}

C语言：

#include<stdio.h>
#include<stdlib.h>
int main()
{
	int a,b;
	printf("input a ,b:\n");
	scanf_s("%d%d",&a,&b);
	a = a^b;
	b = b^a;
	a = a^b;
	printf("after swaping \na:%d\nb:%d\n",a,b);
	system("pause");
	return 0;
}

• 一条语句搞定交换：

a = (a+b)-(b=a);