int main()
{
int a = 10, b = 20;
int temp;
temp = a;
a = b;
b = temp;
printf("a=%d b=%dn", a, b);
return 0;
}
不允许创建临时变量，交换两个数的内容
int main()
{
int a = 10, b = 20;
//第一种方法
//第二种方法
a = a ^ b;
b = a ^ b;
a = a ^ b;
printf("a=%d b=%dn", a, b);
return 0;
}
