试题与答案

有如下程序:#include<iostream>using namespace st

题型:单项选择题

题目:

有如下程序:

#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; //须在类体外给出定义

};

int main( ){

Pair p1(3,4),p2(4,3),p3(4,5);

cout<<(p1>p2)<<(p2>p1)<<(p2>p3)<<(p3>p2);

return 0;

} 运算符函数operator>的功能是比较两个Pair对象的大小,当左边对象大时,返回true,否则返回false。比较规则是首先比较两对象的m成员,m大者为大;当m相等时比较n,n大者为大。程序输出0101,下列对运算符重载函数的正确定义是()

A.bool Pair::operator>(Pair const { if(m! =return m>m; return n>n;}

B.bool Pair::operator>(Pair { if(m! = return m>m; return n>n;}

C.bool Pair::operator>(Pair const { if(m> return true; return n>n;}

D.bool Pair::operator>(Pair { if(m> return true; return n>n;}

答案:

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