#include<stdio.h>

void swapValue1(int &a, int &b) //使用中间变量交换数据
{
 int temp = a;
 a = b;
 b = temp;
}

void swapValue2(int &a, int &b)//使用加减运算完成数据交换
{
 a = a + b;
 b = a - b;
 a = a - b; 
}

void swapValue3(int &a, int &b) //使用位运算交换数据
{
 a^=b;
 b^=a;
 a^=b;
}
int main()
{
 int a1 = 1, b1 = 2;
 int a2 = 3, b2 = 4;
 int a3 = 5, b3 = 6;
 
 swapValue1(a1, b1);
 swapValue2(a2, b2);
 swapValue3(a3, b3);
 
 printf("a= %d b= %d\n",a1, b1);
 printf("a= %d b= %d\n",a2, b2);
 printf("a= %d b= %d\n",a3, b3);
 
 return 0;
}