阅读程序4

#include <iostream>using namespace std;class Pair{    int m;    int n;public:    Pair(int i,int j):m(i),n(j){}    bool operator>(Pair p)const;};bool Pair::operator>(Pair p)const{    if(m!=p.m)        return m>p.m;    return n>p.n;}int main(){   Pair p1(3,4),p2(4,3),p3(4,5);   cout<<(p1>p2)<<(p2>p1)<<(p2>p3)<<(p3>p2)<<endl;    return 0;}