交换两个整型变量的四种方法

1.调用swap函数

#include<stdio.h>
void swap(int *pa,int *pb)
{
	int tmp = 0;
	tmp = *pa;
	*pa = *pb;
	*pb = tmp;
}
int main()
{
	int a = 16;
	int b = 22;
        printf("a = %d  b = %d",a,b);
	swap(&a,&b);
	printf("a = %d  b = %d",a,b);
	return 0;
}

2.运用数学模型

#include<stdio.h>
int main()
{
	int a=16;
	int b=22;
	printf("a=%d b=%d",a,b);
	printf("\n");
	a=a+b;
	b=a-b;
	a=a-b;
	printf("a=%d b=%d",a,b);
	return 0;
}

3.异或

#include<stdio.h>
int main()
{
	int a=16;
	int b=22;
	printf("a=%d b=%d",a,b);
	printf("\n");
	a=a^b;
	b=b^a;
	a=a^b;
	printf("a=%d b=%d",a,b);
	return 0;
}

4.建立临时变量

#include<stdio.h>
int main()
{
	int a = 16;
	int b = 22;
	int tmp = 0;
        printf("a = %d  b = %d",a,b);
	tmp = a;
	a = b;
	b = tmp;
	printf("a = %d   b = %d",a,b);
	return;
}