实现两个数字的交换

实现两个数字的交换
方法1.引入中间变量
#include<stdio.h>
#include <stdlib.h>
	int main(){
		int a = 20;
		int b = 10;
		int tep;
		if ( a> b){
			tep = a;
			a = b;
			b = tep;
			printf("a=%d b=%d\n", a, b);
		}	
	system ("pause");
	return 0;
	}

方法2.未引入中间变量(按位异或实现)
#include<stdio.h>
#include <stdlib.h>
#include <math.h>
int main(){
	int a = 20;
	int b = 10;
	if (a > b){
	//进行按位异或
		a = a^b;
		b = a^b;
		a = a^b;
		printf("a=%d b=%d\n", a, b);
	}
	system("pause");
	return 0;
}

方法3.未引入中间变量（加减）
#include<stdio.h>
#include <stdlib.h>
#include <math.h>
int main(){
	int a = 20;
	int b = 10;
	if (a > b){
		a = a + b;//30  10
		b = a - b;//30  20
		a = a - b;//10  20
		printf("a=%d b=%d\n", a, b);
	}
	system("pause");
	return 0;
}

**运行结果一样 **
*运行结果：