订票例子

#include<iostream>
#include<string>
#include<fstream>
#include<sstream>
using namespace std;
#define _CRT_SECURE_NO_WARNINGS
class Tair //通过定义一个类来定义数据录入的函数
{
 char flight[20]; char data[20]; char start[20];
 char finish[20]; char stime[20]; char ftime[20]; int price;
public:
 Tair()
 {};
 Tair(char fl[20], char D[20], char S[20], char Fin[20], char st[20], char ft[20], int pr);
 friend void main(); //将主函数定义为友元函数，方便访问类中的成员
};

Tair::Tair(char fl[20], char D[20], char S[20], char Fin[20], char st[20], char ft[20], int pr)
{
 strcpy(flight, fl); //
 strcpy(data, D);
 strcpy(start, S);
 strcpy(finish, Fin);
 strcpy(stime, st);
 strcpy(ftime, ft);
 price = pr; //
}

void main()
{
 int p = 0; //全局变量，用于选择菜单时的输入
 Tair *s[100]; //类定义的指针将所录入的数据按类中的形式分别存储
 ofstream *file[100];
 int i = 0; //全局变量，用于做每个录入数据的下标
 int j = 0;
 int chris1 = 0;//用于判断do—while语句
 while (p != 6)
 {
  cout << " ************ 欢迎来到民航售票系统，请选择您需要的操作并输入相应数字! *********** ";
  cout << "(1)录入信息 ";
  cout << "(2)按起点查出所有航班的信息 ";
  cout << "(3)按终点查出所有航班的信息 ";
  cout << "(4)按日期、航班号查询航班信息 ";
  cout << "(5)按起点站统计航班数 ";
  cout << "(6)退出 ";
  do //判断输入指令是否正确
  {
   cin >> p;
   if ((p >= 1 && p <= 6))
    chris1 = 1;
   else
    cout << "指令错误！请重新输入：" << endl;
  } while (chris1 == 0);
  do
  {
   switch (p)
   {
   case 1://录入
   {
        char flight[20], data[20], start[20], finish[20], stime[20], ftime[20];
        int price; char c; //用于在小项中选择是否继续操作
        do
        {
         cout << "请依次输入航班号、日期、起点站、终点站、起飞时间、到达时间、票价 ";
         cin >> flight >> data >> start >> finish >> stime >> ftime >> price;
         fstream outfile, infile; //作一个文本文档在文件夹中用于显示所录入的数据
         outfile.open("flight.txt", ios::out | ios::app); //以向文件追加写入的方式打开文件flight.txt
         if (!file)
         {
          cout << "flight.txt can not open. ";
          return;
         }
         outfile << "航班号:" << flight << " " << "日期:" << data << " " << "起点站:" << start << " " << "终点站:" << finish << " " << "起飞时间:" << stime << " " << "到达时间:" << ftime << " " << "票价:" << price << endl;

         outfile.close();
         infile.open("flight.txt", ios::in);
         if (!file) //判断文件是否打开
         {
          cout << "f1.txt can not open. ";
          return;
         }
         char ch;
         while (infile.get(ch))
          cout << ch;
         cout << endl << endl;
         infile.close();
         j++;
         s[i] = new Tair(flight, data, start, finish, stime, ftime, price);
         i++;
         cout << "已录入" << i << "条航班信息，想继续录入吗(y/n)" << endl;
         cin >> c;
         chris1 = 0;

         if (c != 'y'&&c != 'n')
         {
          cout << "指令错误！请重新输入！" << endl;
          cin >> c;
         }
        }
        while (c == 'y');
        break;
   }
   case 2://按起点站查询
   {
        char st[20]; char c; int j = 0; int flag;
        if (i == 0)
        {
         cout << "系统中没有航班信息,请先进行录入操作!" << endl; break;
        }
        do
        {
         flag = 0;
         cout << "请输入要查询的航班的起点站: " << endl;
         cin >> st;
         cout << "您要查询的起点站为%c的航班信息如下:" << st << endl << endl;
         for (int j = 0; j<i; j++)
         {
          if (strcmp(st, (*s[j]).start) == 0)//比较字符串相等
          {
           flag = 1;

           cout << "航班号:" << (*s[j]).flight << " 日期:" << (*s[j]).data << " 终点站:" << (*s[j]).finish << " 起飞时间:" << (*s[j]).stime << " 到达时间:" << (*s[j]).ftime << " 票价:" << (*s[j]).price << endl;
          }
         }
         if (flag == 0) cout << "对不起，您查询的航班信息不存在!" << endl << endl;
         cout << "您想继续查询吗?(y/n):";
         cin >> c;
         if (c != 'n'&&c != 'y')
         {
          cout << "指令错误！请重新输入:" << endl;
          cin >> c;
         }
        } while (c == 'y');
        break;
   }
   case 3://按终点站查询
   {
        char fin[20]; char c; int j = 0; int flag;
        if (i == 0)
        {
         cout << "系统中没有航班信息,请先进行录入操作!" << endl; break;
        }
        do
        {
         flag = 0;
         cout << "请输入要查询的航班的终点站: " << endl;
         cin >> fin;
         cout << "您要查询的终点站为" << fin << "的航班信息如下:" << endl << endl;
         for (int j = 0; j<i; j++)
         {
          if (strcmp(fin, (*s[j]).finish) == 0)
          {
           flag = 1;

           cout << "航班号:" << (*s[j]).flight << " 日期:" << (*s[j]).data << " 起点站:" << (*s[j]).start << " 起飞时间:" << (*s[j]).stime << " 到达时间:" << (*s[j]).ftime << " 票价:" << (*s[j]).price << endl;
          }
         }
         if (flag == 0) cout << "对不起，您查询的航班信息不存在!" << endl;
         cout << "您想继续查询吗?(y/n):";
         cin >> c;
         if (c != 'n'&&c != 'y')
         {
          cout << "指令错误！请重新输入:" << endl;
          cin >> c;
         }
        } while (c == 'y');
        break;
   }
   case 4://按日期、航班号查询
   {
        char dat[20], fli[20]; char c; int j, flag;
        if (i == 0)
        {
         cout << "系统中没有航班信息,请先进行录入操作!" << endl; break;
        }
        do
        {
         flag = 0;
         cout << "请输入要查询的航班的日期和航班号: " << endl;
         cin >> dat >> fli;
         cout << "您要查询的日期为" << dat << ",航班号为" << fli << "的航班信息如下:" << endl << endl;
         for (j = 0; j<i; j++)
         {
          if (strcmp(dat, (*s[j]).data) == 0 && strcmp(fli, (*s[j]).flight) == 0)
          {
           flag = 1;

           cout << "起点站:" << (*s[j]).start << " 终点站:" << (*s[j]).finish << " 起飞时间:" << (*s[j]).stime << " 到达时间:" << (*s[j]).ftime << " 票价:" << (*s[j]).price << endl;
          }
         }
         if (flag == 0) cout << "对不起，您查询的航班信息不存在!" << endl;
         cout << "您想继续查询吗?(y/n):";
         cin >> c;
         if (c != 'n'&&c != 'y')
         {
          cout << "指令错误！请重新输入:" << endl;
          cin >> c;
         }
        } while (c == 'y');
        break;
   }
   case 5://按起点或终点统计一周的航班数
   {
        int count, flag, j;
        char str[20]; char c;
        if (i == 0)
        {
         cout << " 系统中没有航班信息,请先进行录入操作!" << endl; break;
        }
        do
        {
         flag = 0; count = 0;
         cout << " 请输入要统计的航班起点站:" << endl;
         cin >> str;
         for (j = 0; j<i; j++)
         {
          if (strcmp(str, (*s[j]).start) == 0)
          {
           flag = 1;
           count++;
          }
         }
         if (j >= i && flag == 0)
          cout << "对不起，您查询的航班信息不存在!" << endl << endl;
         else
          cout << " 您要查询的起点站为" << str << "的航班数为:" << count << endl << endl;
         cout << "您想继续查询吗?(y/n):";
         cin >> c;
         if (c != 'n'&&c != 'y')
         {
          cout << "指令错误！请重新输入:" << endl;
          cin >> c;
         }
        } while (c == 'y');
        break;
   }
   case 6://退出
   {
        cout << endl << "********* 感谢您的使用，( ^_^ )/~~拜拜! **********" << endl;
        break;
   }

   }break;
  } while (chris1 == 0);
 }
}