#include<iostream>
using namespace std;
class Student
{
private:
	char *name[5];
	int length;
	float grade[5];
public:
	Student(){length=0;}
	Student(char *n[],float g[],int l);
	~Student(){}
void insert(char *a,int b,float c);   //a=name,b=location,c=grade
	void Delete(int b);
	void locate(int b);
	void print();
};


Student::Student(char *n[],float g[],int l)
{
	for(int i=0;i<=3;i++)
	{
		name[i]=n[i];
		grade[i]=g[i];
	}
	length=l;
}


void Student::insert(char *a,int b,float c)
{
	if(length>=5)
		cout<<"錯誤！不能再輸入資料！"<<endl;
	else{
		length--;
	for(int i=length;i>b;i--)
	{
		name[i-1]=name[i-2];
		grade[i-1]=grade[i-2];
	}
	name[b-1]=a;
	grade[b-1]=c;
	cout<<"資訊列入成功"<<endl;
	}
}


void Student::Delete(int b)
{
	if(length==0)cout<<"無資料"<<endl;
	else if(b<1||b>length)
		cout<<"位置非法"<<endl;
	else
	{
		cout<<name[b-1]<<"資料已經刪除。"<<endl;}
	for(int i=b;i<length;i++)
	{
		name[i-1]=name[i];
		grade[i-1]=grade[i];
	}
	length--;
}


void Student::locate(int b)
{
	if(length==0)cout<<"無資料"<<endl;
	else if(b<1||b>length)cout<<"位置非法"<<endl;
	else
	{cout<<"第"<<b<<"位學生資料為"<<name[b-1]<<" "<<grade[b-1]<<endl<<endl;}
}


void Student::print()
{
	if(length==0)cout<<"無資料"<<endl;
	else
	{
	for(int i=0;i<length;i++)
		cout<<name[i]<<" "<<grade[i]<<endl;
	cout<<endl;
	}
}


int main()
 {
	cout<<"學生成績系統"<<endl;
	char *n[2]={"ke","rou"};
	float g[2]={78,87};
	Student a(n,g,2);
	int y;
	float z;
	char x[5];
	for(int i=0;i<3;i++)
	{
	cout<<"輸入學生的名字:";
	cin>>x;
	cout<<endl<<"輸入學生的分數:";
	cin>>z;
	cout<<endl<<"輸入學生的學號:";
	cin>>y;
	cout<<endl;
	}
	a.insert(x,y,z);
	cout<<endl<<"輸入要刪除的學號:";
	cin>>y;
	a.Delete(y);
	cout<<endl<<"輸入要查詢的學生資訊的學號:";
	cin>>y; 
	a.locate(y);
	cout<<endl<<endl<<endl<<"顯示所有學生資訊:"<<endl;
	a.print();
	return 0;

}