C++面试题之数a、b的值互换（不使用中间变量）

 #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;}