这是我正在从事的一个项目，它来自我用来学习 C++ 的书——“从 C++ 开始”。我目前对项目的收银部分有疑问。它要求用户输入图书的日期、数量、isbn、书名和价格。然后，它会询问用户是否希望输入另一本书。无论他们键入“y”还是“n”，它都会继续到程序的下一部分。我真的不知道为什么在我输入“y”进入另一本书后for循环不重复。此外，日期在显示时最后会出现垃圾，这是我需要修复的另一件事。任何帮助，将不胜感激。肯定有更多问题，但主要问题在于第一个 for 循环中的收银员功能。我没有'
/*
* mainmenu.cpp
* Serendipity Booksellers software
*
* Created by Abraham Quilca on 9/5/12.
* Copyright 2012 __MyCompanyName__. All rights reserved.
*
*/
#include<iostream>
#include<iomanip>
#include<cstring>
#include"mainmenu.h"
using namespace std;
char bookTitle[20][51],
isbn[20][14],
author[20][31],
publisher[20][31],
dateAdded[20][11];
int qtyOnHand[20];
double wholesale[20];
double retail[20];;
int main()
{
int choice;
do
{
cout << "\t\t Serendipity Booksellers"<< endl;
cout << "\t\t\t Main Menu" << endl << endl;
cout << "\t\t1. Cashier Module" << endl;
cout << "\t\t2. Inventory Database Module" << endl;
cout << "\t\t3. Report Module" << endl;
cout << "\t\t4. Exit" << endl << endl;
cout << "\t\tEnter your choice: ";
cin >> choice;
cout << endl;
switch (choice)
{
case 1:
cashier();
break;
case 2:
invmenu();
break;
case 3:
reports();
break;
case 4:
continue;
break;
default:
cout << "\t\tPlease enter a number in the range 1-4." << endl << endl;
}
}
while(choice != 4);
cout << "\t\tYou selected item 4." << endl;
return 0;
}
// Cashier function
void cashier()
{
char again;
char date[8];
int quantity[20] = {0};
char ISBN[20][20] = {0};
char title[20][40] = {0};
float price[20] = {0}, bookTotal[20] = {0}, subtotal, total, tax;
const float tax_rate = .06;
cout << "Serendipity Booksellers" << endl;
cout << " Cashier Module" << endl << endl;
for(int count = 0; count < 20; count++)
{
cout << "Date: ";
cin >> date;
cout << "Quantity of Book: ";
cin >> quantity[count];
cout << "ISBN: ";
cin >> ISBN[count];
cout << "Title: ";
cin.ignore();
cin.getline(title[count], 40);
cout << "Price: ";
cin >> price[count];
bookTotal[count] = quantity[count] * price[count];
subtotal += price[count];
cout << "Would you like to enter another book? (Y/N) ";
cin >> again;
if(again == 'N' || 'n')
count = 21; // This line will end the for loop
}
// Calculating tax and total
tax = subtotal * tax_rate;
total = subtotal + tax;
cout << "\n\nSerendipity Booksellers" << endl << endl;
cout << "Date:" << date << endl << endl;
cout << "Qty\t ISBN\t\t "
<< left << setw(40) << "Title" << "Price\t Total" << endl
<< "-------------------------------------------------------------------------------"
<< endl << endl;
for(int count = 0; count < 20; count++)
{
cout << quantity[count] << "\t " << ISBN[count] << " " << left << setw(40) << title[count]
<< setprecision(2) << fixed << "$" << setw(6) << price[count] << " $" << setw(6) << bookTotal[count]
<< endl << endl;
}
cout << "\t\t\t Subtotal" << "\t\t\t\t $" << setw(6) << subtotal << endl;
cout << "\t\t\t Tax" << "\t\t\t\t $" << setw(6) << tax<< endl;
cout << "\t\t\t Total" "\t\t\t\t $" << setw(6) << total << endl << endl;
cout << "Thank You for Shopping at Serendipity!" << endl << endl;
}