考研编程练习----swap

void swap(int a ,int b)

{

　　a^=b;

　　b^=a;  //b =b^a^b //b = b^b^a;//b = a;  按位异或满足交换律

　　a^=b; //a = a^b^a //a = a^a^b;//a = b;

}