#include <iostream>
using namespace std;
class Stu
{
public:
char *name;
double score;
Stu(char *x,double y)
{
    *name=*x;
    score=y;
}
friend int bijiaoda(int a,int b)
{
    int max;
    if(a>b)
    max=a;
    else
    max=b;
    return max;
}
friend int bijiaoxiao(int c,int d)
{
    int min;
    if(c<d)
    min=c;
    else
    min=d;
    return min;
}
};
void main ()
{
    int max1,max2,max3,max4,min1,min2,min3,min4;
    char a[6]="zhang",b[5]="wang",c[5]="zhao",d[3]="li",e[5]="chen";
    char *f=&a[0],*g=&b[0],*h=&c[0],*i=&d[0],*j=&e[0];
    Stu s1(f,78),s2(g,80),s3(h,92),s4(i,65),s5(j,50);
    max1=bijiaoda(s1.score,s2.score);
    max2=bijiaoda(max1,s3.score);
    max3=bijiaoda(max2,s4.score);
    max4=bijiaoda(max3,s5.score);
    cout<<"这五个学生中的最高分是:"<<max4;
    min1=bijiaoxiao(s1.score,s2.score);
    min2=bijiaoxiao(min1,s3.score);
    min3=bijiaoxiao(min2,s4.score);
    min4=bijiaoxiao(min3,s5.score);
    cout<<"这五个学生中的最低分是:"<<min4;
}