9_78.cpp

几个C++程序设计实例

#include<iostream.h>
#include<iomanip.h>
#define Max 20
class English
{
	int ptr;
	int score[Max];
public:
	void getdata(int val,int ptr) {score[ptr]=val;}
	int disp(int ptr){return score[ptr];}
};
class Computer
{
	int ptr;
	int score[Max];
public:
	void getdata(int val,int ptr) {score[ptr]=val;}
	int disp(int ptr){return score[ptr];}
};
class Chinese
{
	int ptr;
	int score[Max];
public:
	void getdata(int val,int ptr) {score[ptr]=val;}
	int disp(int ptr){return score[ptr];}
};
class Student:private English,private Computer,private Chinese
{
	char name[Max][10];
	double average[Max];
	static int rank;
public:
	void getdata(int index)
	{
		int score1,score2,score3;
		for(int i=0;i<index;i++)
		{
			average[i]=0;
			cout<<"学生姓名:";
			cin>>name[i];
			cout<<"英语 计算机 中文成绩:";
			cin>>score1>>score2>>score3;
			average[i]+=score1;
			average[i]+=score2;
			average[i]+=score3;
			English::getdata(score1,i);
			Computer::getdata(score2,i);
			Chinese::getdata(score3,i);
			average[i]/=3;
		}
	}

	void sort(int index)  //直接选择排序
	{
	    int i,j,pick;
    	for(i=0;i<index;i++)
		{
	    	pick=0;
	    	while(average[pick]==-1 && pick<index) pick++;
	    	for(j=1;j<index;j++)
			{
		    	while(average[j]==-1 && j<index) j++;
		    	if(j<index && average[j]>average[pick])
				pick=j;
			}
	    	cout<<setw(3)<<rank++<<" ";
            cout<<setw(6)<<name[pick]<<" ";
	    	cout<<setw(5)<<English::disp(pick)<<" ";
	    	cout<<setw(7)<<Computer::disp(pick)<<" ";
	    	cout<<setw(5)<<Chinese::disp(pick)<<" ";
		    cout<<setw(10)<<setprecision(4)<<average[pick]<<endl;
	    	average[pick]=-1;
		}
	}
};
int Student::rank=1;
void main()
{
	Student A;
	int num;
	cout<<"学生人数:";
	cin>>num;
	A.getdata(num);
    cout<<"输出结果:"<<endl;
	cout<<setw(4)<<"名次"<<setw(6)<<"姓名"<<setw(6)<<"英语"<<setw(9)\
		<<"计算机"<<setw(6)<<"中文"<<setw(10)<<"平均分"<<endl;
	A.sort(num);
}