第4题

#include<iostream>#include<string>using namespace std;class Student{private:int num;double mark;public:void setdata(){cin>>num;cin>>mark;}void display(){cout<<"num="<<num<<endl;cout<<"mark="<<mark<<endl;}};int main(){int i;Student *p;p=new Student[5];for(i=0;i<5;i++){cout<<"请输入学号和成绩"<<endl;p[i].setdata(); }for(i=0;i<5;i+=2){p[i].display();}return 0;}