4.17

#include<iostream>
#include<string>
using namespace std;
class student
{
public:
	 student (string a,double b)
   {
		num=a;
		score=b;
   }
	 void show();
private:
	string num;
    double score;
};
void student:: show()
{
    cout<<num<<" "<<score<<endl;

}
int main()
{
	student *pr;
	student stu[6]={student("wubeiren",89),student("yanwenfa",100),student("lianjinxin",94),student("lvyingchuang",100),
		student("zhangya",96),student("liyifan",98)};
	pr=stu;
	pr=pr+1;
	pr->show();
	pr=pr+2;
	pr->show();
	pr=pr+2;
	pr->show();
	return 0;
}