刚刚接触C++，有有一道题目做不出来，求帮助 - 编程论坛

#2

laoyang1032010-12-09 13:55

程序代码：

#include <iostream.h>
#include <string.h>
class Student
{
    friend class CProcess;
private:
    char *name;
    int  socre;
    int  lev[5];
public:
    Student(char *name,int socre);
    ~Student();
};
Student::Student(char *name,int socre)
{
    this->name=new char[strlen(name)+1];
    strcpy(this->name,name);
    this->socre=socre;
    for(int i=0;i<5;i++)
    {
        this->lev[i]=0;//等于1的位置代表等级  例如 lev[0]=1  代表不及格
    }
}
Student::~Student()
{
    ;
}
class CProcess
{
public:
    CProcess()
    {;}
    ~CProcess()
    {;}
    void Transform(Student& s);
    void Display(Student& s);
};
void CProcess::Transform(Student& s)
{
    if(s.socre>=90)/////开始判定
        s.lev[4]=1;
    if(s.socre>=80&&s.socre<=89)
        s.lev[3]=1;
    if(s.socre>=70&&s.socre<=79)
        s.lev[2]=1;
    if(s.socre>=60&&s.socre<=69)
        s.lev[1]=1;
    if(s.socre<=60)
        s.lev[0]=1;
}
void CProcess::Display(Student& s)
{
    cout<<"姓名:"<<s.name;
    cout<<"成绩 :"<<s.socre;
    for(int i=0;i<5;i++)
    {
        if(s.lev[i]==1)
           cout<<"等级 :"<<i;
    }
}
int main()
{
    Student s("yang",92);
    CProcess p;
    p.Transform(s);
    p.Display(s);
    return 0;
}

好了你可以去测试了主函数自己写一个如果是作业对不起你们老师了呵呵

#3

红尘梦1234562010-12-09 16:12

嘿嘿，谢谢了，我仔细研究研究

#4

zhangnanok12010-12-10 16:35

调试出错啊   syntax error : identifier 's'

void CProcess::Transform(CStudent& s)
{
    if s.degree>=90
        s.Level[4]=1;
    if (s.degree>=80 && s.degree<90)
        s.Level[3]=1;
    if    (s.degree>=70 && s.degree<80)
        s.Level[2]=1;
    if (s.degree>=60 && s.degree<70)
        s.Level[1]=1;
    if s.degree<60
        s.Level[0]=1;
};

#5

Mack22010-12-10 21:01

#include<iostream.h>
#include<string.h>
class CProcess;
class CStudent
{
    public:
    CStudent();
    friend class CProcess;
    private:
        char Name[10];
        float Degree;
        char*Level;
};
class CProcess
{
public:
void Transform(CStudent& s);
void Display(CStudent& s);
};
CStudent::CStudent()
{
    char na[10];
    float de;
    cout<<"输入姓名:"<<endl;
    cin>>na;
    cout<<"输入成绩:"<<endl;
    cin>>de;
    strcpy(Name,na);
    Degree=de;
}
void CProcess::Transform(CStudent& s)
{
    if(s.Degree>=90)
        s.Level="优秀";
    else if(s.Degree>=80)
        s.Level="良好";
    else if(s.Degree>=70)
        s.Level="中等";
    else if(s.Degree>=60)
        s.Level="及格";
    else
        s.Level="不及格";

}
void CProcess::Display(CStudent& s)
{

    cout<<s.Name<<"    "<<s.Degree<<"     "<<s.Level<<endl;
}
int main()
{
CStudent stu1,stu2,stu3,stu4;
CProcess po;
po.Transform(stu1);
po.Transform(stu2);
po.Transform(stu3);po.Transform(stu4);
cout<<"姓名"<<"    "<<" 成绩 "<<"    "<<"等级"<<endl;
po.Display(stu1);
po.Display(stu2);
po.Display(stu3);po.Display(stu4);
return 0;
}
此程序是很简单的，核心是明白友元类特点，但是在平时要慎重的应用友元。