不用临时变量，实现两个数的交换

 不用临时变量，实现两个数的交换

#include <stdio.h>void swap(int *a, int *b){*a = *a ^ *b;*b = *b ^ *a;*a = *a ^ *b;}int main(){int a, b;a = 10;b = 100;    swap(&a, &b);printf("%d %d", a, b);}    

 

 

a = a ^ b;   (1)

b = b ^ a;   (2)

a = a ^ b;   (3)

 

 

b = b ^ ( a ^ b) = b ^ b ^ a = 0 ^ a = a

 

a =  a ^ b  ^ a = b;