#include"head.h"
#include<iostream.h>
#include<stdlib.h>
#include<string.h>

extern void DisplayScore(Student* &);

void ChangeScore(Student* &head)
{
	Student* pGuard;
	char choice;
	char Name[20];
	int Class,Number,icount;

	cout<<"已記錄的學生如下:"<<endl;
	DisplayScore(head);

	cout<<"說明:本程序提供①根據學生的學號"
		<<"               ②根據學生姓名和所在的班級"
		<<"               兩種方式來查找并修改學生的成績."
		<<endl;
status0:
	cout<<"請選擇修改方式(1/2):";
	cin>>choice;
	system("cls");

	if(choice=='1')
	{
status1:
		cout<<"請輸入要修改的學生的學號:"<<endl;
		cin>>Number;

		for(pGuard=head;pGuard!=NULL;pGuard=pGuard->next)
		{
			if(pGuard->Number==Number)
			{
				system("cls");

				cout<<"找到該學生,已記錄的成績如下:"<<endl;
				
				cout<<"		微積分成績:		"<<pGuard->Score [0]<<endl;
		
				cout<<"		物理成績:		"<<pGuard->Score [1]<<endl;

				cout<<"		英語成績:		"<<pGuard->Score [2]<<endl;

				cout<<"		C語言成績:		"<<pGuard->Score [3]<<endl;
		
				cout<<"		體育成績:		"<<pGuard->Score [4]<<endl;
				
				cout<<"現在請輸入新的學生成績(如果沒有變化請按照原來的數值輸入):"<<endl;
status2:
				cout<<endl<<"學生所學的科目為:微積分,物理,英語,C語言,體育.下面請分別輸入該學生的各科成績:"
					<<endl;
	
				for(icount=0,pGuard->Average=0.0;icount<MAX;icount++)
				{
					cin>>pGuard->Score[icount];
					pGuard->Average+=pGuard->Score[icount];
				}
				pGuard->Average/=5;
status3:				
				cout<<"請核對以上信息,輸入內容完全無誤嗎?  (y/n):"<<endl;
				cin>>choice;

				if(choice=='N'||choice=='n')
				{
					cout<<"那么請重新輸入吧."<<endl;
					system("pause");
					system("cls");
					goto status2;
				}
				else if(choice!='Y'&&choice!='y'&&choice!='N'&&choice!='n')
				{
					cout<<"您鍵入的內容有錯,請重新選擇."<<endl;
					system("pause");
					system("cls");
					goto status3;
				}
								
				cout<<"已成功修改該學生的信息!"<<endl;
				return;
			}
		}
		cout<<"沒有找到該學生的信息!"<<endl;
status4:
		cout<<"要重新輸入學生的學號嗎?(y/n):";
		cin>>choice;
		if(choice=='y'||choice=='Y')
		{
			cout<<"那么請重新輸入吧!"<<endl;
			system("pause");
			goto status1;
		}
		else if(choice!='y'&&choice!='Y'&&choice!='n'&&choice!='N')
		{
			cout<<"您鍵入的內容有誤,請重新選擇."<<endl;
			goto status4;
		}
	}
	else if(choice=='2')
	{
status5:
		cout<<"請輸入要修改的學生的姓名:";
		cin>>Name;
		cout<<"請輸入學生所在的班級:";
		cin>>Class;

		for(pGuard=head;pGuard!=NULL;pGuard=pGuard->next)
		{
			if(pGuard->Class==Class&&strcmp(pGuard->Name,Name)==0)
			{
				cout<<"找到該學生,已記錄的成績如下:"<<endl;
				
				cout<<"		微積分成績:		"<<pGuard->Score [0]<<endl;
		
				cout<<"		物理成績:		"<<pGuard->Score [1]<<endl;

				cout<<"		英語成績:		"<<pGuard->Score [2]<<endl;

				cout<<"		C語言成績:		"<<pGuard->Score [3]<<endl;
		
				cout<<"		體育成績:		"<<pGuard->Score [4]<<endl;
				
				cout<<"現在請輸入新的學生成績(如果沒有變化請按照原來的數值輸入):"<<endl;

				cout<<endl<<"學生所學的科目為:微積分,物理,英語,C語言,體育.下面請分別輸入該學生的各科成績:"
					<<endl;
	
				for(pGuard->Average=0.0,icount=0;icount<MAX;icount++)
				{
					cin>>pGuard->Score[icount];
					pGuard->Average+=pGuard->Score[icount];
				}
				pGuard->Average/=5;
status6:
				cout<<"請核對以上信息,輸入內容完全無誤嗎?  (y/n):"<<endl;
				cin>>choice;

				if(choice=='N'||choice=='n')
				{
					cout<<"那么請重新輸入吧."<<endl;
					system("pause");
					system("cls");
					goto status6;
				}
				else if(choice!='Y'&&choice!='y'&&choice!='N'&&choice!='n')
				{
					cout<<"您鍵入的內容有錯,請重新選擇."<<endl;
					system("pause");
					system("cls");
					goto status6;
				}
				
				cout<<"已成功修改該學生的基本信息."<<endl;
				return;
			}
		}
		cout<<"沒有找到該學生的信息!"<<endl;
status7:
		cout<<"要重新輸入學生的班級和姓名嗎?(y/n):";
		cin>>choice;
		if(choice=='y'||choice=='Y')
		{
			cout<<"那么請重新輸入吧!"<<endl;
			system("pause");
			goto status5;
		}
		else if(choice!='y'&&choice!='Y'&&choice!='n'&&choice!='N')
		{
			cout<<"您鍵入的內容有誤,請重新選擇."<<endl;
			goto status7;
		}
	}
	else if(choice!='1'&&choice!='2')
	{
		cout<<"您鍵入的內容有錯,請重新選擇."<<endl;
		goto status0;
	}
}