#include<stdio.h>
#include<string.h>
#include<iostream.h>
#include<stdlib.h>
#include<ctype.h> 
#include<time.h>
#define random(x) (rand()%x)                                                    //產生隨機數

long Input_number()                                                              //判斷輸入的數是否為整數
{
	char number[10];
	long s=0;
continue2: gets(number);
	for(int i=0;i<strlen(number);i++)
		if(!isdigit(number[i]))
		{cout<<"不合法！請重新輸入數字："<<endl;goto continue2;}
	for(int i=0;i<strlen(number);i++)
	{
		s=s*10+(number[i]-48);
	}
	return s;
} 

int Judge_letter(char *answer)                                                  //判斷輸入的字母是否合法
{
	while(strlen(answer)!=1)
	{
		cout<<"不合法！請重新輸入字母：";
		cin>>answer;
	}
	if(*answer=='y')return 1;
	else
		if(*answer=='n'){ return 0;}
	else
	{
		cout<<"不合法！請重新輸入字母：";
		cin>>answer;
		Judge_letter(answer);
	}
}

int number_circulate(int check_letter)                                          //確定數的范圍
{
	int i,x,number,a;
	int number_copy1,number_copy2;
	char answer[10];
	while(check_letter!=0)
	{
		cout<<"您只有5次機會."
			<<"請輸入1~100之間的一個整數:\n"<<endl;
		srand((int)time(NULL));
		x=random(100);
		number_copy1=0,number_copy2=100;
		
		for(i=4;i>0;i--)
		{
			number=Input_number();
			while(number<=number_copy1||number>=number_copy2)                   //判斷數是否在范圍內
			{
				cout<<"輸入的數不在范圍之內,請重新輸入:\n"<<endl;
				number=Input_number();
			}
		                          
			if(number>x)
			{
				cout<<"輸入的數不正確,還有"<<i<<"次機會,現在的范圍是:"
					<<number_copy1<<"~"<<number<<endl<<endl;
				number_copy2=number;
			}
			else
				if(number<x)
				{
					cout<<"輸入的數不正確,還有"<<i<<"次機會,現在的范圍是"
						<<number<<"~"<<number_copy2<<endl<<endl;
					number_copy1=number;
				}
			else
			{
				cout<<"恭喜您,回答正確!"<<endl;goto continue1;
			}
		}
		number=Input_number();
		if(number!=x)
			cout<<"對不起,您已經沒有機會了!"<<endl;
		else
			cout<<"恭喜您,回答正確!"<<endl;
		cout<<"正確答案是:"<<x<<endl;
continue1:cout<<"想再來一次嗎?y/n"<<endl;
		cin>>answer;
		check_letter=Judge_letter(answer);
	}
	return 1;
}

void main()
{
	int check;
	char answer[10];
    cout  <<"                  =================================="<<endl;
    cout  <<"                        歡迎使用猜數字游戲！        "<<endl;
    cout  <<"                       Made By LWW on 24/10/2008    "<<endl;
    cout  <<endl;
    cout  <<"游戲說明：系統將隨機給出一個0~100之間的整數，您的任務就是猜出這個數！"<<endl;
	cout  <<"          錯誤輸入時，系統將會出現提示！"<<endl;
    cout  <<"                  =================================="<<endl;
   	putchar('\n');
	cout  <<"                          是否要開始游戲:（y/n）"<<endl;
	cout  <<"在此輸入:";
	gets(answer);
	putchar('\n');
	check=Judge_letter(answer);                                                 //判斷輸入的字母是否合法
	number_circulate(check);	                                                //確定數的范圍
	cout<<"游戲結束!謝謝您的使用!"<<endl;
}