#include <iostream>
using namespace std;
#define D(x) cout<<#x<<" = "<<x<<endl;
#define exchange(a,b) (a=a^b,b=a^b,a=a^b)
int main(int argc, char *argv[]) {
int a=4;
exchange(a, a);
D(a)
}
a = 0
当两个数一样时会变为0
可以用<algorithm>的swap()函数
#include <iostream>
using namespace std;
#define D(x) cout<<#x<<" = "<<x<<endl;
#define exchange(a,b) (a=a^b,b=a^b,a=a^b)
int main(int argc, char *argv[]) {
int a=4;
exchange(a, a);
D(a)
}
a = 0
当两个数一样时会变为0
可以用<algorithm>的swap()函数