5.4.cpp

关于友元的实验程序源代码

#include <iostream.h>
class  Student  
{
private:int i,j;
      float n,m[100];
      float a[100],t;
public:
	friend  class  AllStudent; 
	void GetX();
    Student(){};
    ~Student(){};
};

class AllStudent
{
private:
     Student b;

public:
    	AllStudent(){};
    ~AllStudent(){};
	void Display();


};

void Student::GetX()
{   cout<<"输入学生人数:";
        cin>>n;cout<<endl;
	    for( i=1;i<=n;i++)
		{cout<<"输入学生学号:";cin>>m[i];
	    cout<<"输入学生成绩:";
	    cin>>a[i];cout<<endl;
	    
		}
	    
		 for(i=1;i<=n;i++)
		  {for( j=1;j<=n;j++)
              {if(a[i]<=a[j])
			    {t=a[i];a[i]=a[j];a[j]=t;
		          t=m[i];m[i]=m[j];m[j]=t;}}}
		 cout<<"排序后:"<<endl;
		  cout<<"     学生学号"<<" "<<"学生成绩"<<endl;
	     for(j=1;j<=n;j++)
		{cout<<"      "<<m[j]<<"          "<<a[j]<<endl; }
}

void AllStudent::Display()
{ b.GetX();}


void main()
{    
     AllStudent myAllStudent;
	 myAllStudent.Display();
}