我正在制作一个程序，从文件中获取信息，然后将其放入结构中，然后生成一个结构数组。我已经完成了程序，但是当我编译时，我得到2个错误。 “预期声明”和“语法错误：常量”都指向读入文件的第一行。我不知所措，我不知道如何让它运行。我使用的代码如下所示：
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
#include <stdlib.h>
using namespace std;
struct book
{
int ISBN;
string Author;
string Title;
int Quantity;
double price;
};
void choice1(book books[], int& size, int MAX_SIZE)
{
ifstream inFile;
inFile.open("Inventory.txt");
string str;
while (inFile && size < MAX_SIZE)
{
getline(inFile, str);
books[size].ISBN = atoi(str.c_str());
getline(inFile, books[size].Author);
getline(inFile, books[size].Title);
getline(inFile, str);
books[size].Quantity = atoi(str.c_str());
getline(inFile, str);
books[size].price = atoi(str.c_str());
getline(inFile, str);
size++;
}
cout << "You have successfully read the file." << endl;
inFile.close();
}
void choice2(book books[], int size)
{
for (int i = 0; i < size; i++)
{
cout << endl;
cout << "Book Number: " << (i + 1) << endl;
cout << "ISBN: " << books[i].ISBN << endl;
cout << "Author: " << books[i].Author << endl;
cout << "Title: " << books[i].Title << endl;
cout << "Quantity: " << books[i].Quantity << endl;
cout << "Price: $" << books[i].price << endl;
}
if (size != 0)
cout << "You have successfully printed the array." << endl;
else
cout << "Array is empty. Read the file first." << endl;
}
void choice3(book books[], int size)
{
if (size == 0)
cout << "Array is empty. Read the data first." << endl;
else
{
int isbn;
int option;
int qty;
cout << "\nEnter the ISBN of the book: ";
cin >> isbn;
cout << "1. Increment" << endl;
cout << "2. Decrement" << endl;
cout << "3. Add New" << endl;
cout << "Enter your option: ";
cin >> option;
cout << "Enter the quantity: ";
cin >> qty;
for (int i = 0; i < size; i++)
{
if (books[i].ISBN == isbn)
{
if (option == 1)
books[i].Quantity += qty;
else if (option == 2)
{
books[i].Quantity -= qty;
if (books[i].Quantity)
books[i].Quantity = 0;
}
else if (option == 3)
books[i].Quantity = qty;
break;
}
}
cout << "You have successfully updated the array." << endl;
}
}
void choice4(book books[], int& size, int MAX_SIZE)
{
if (size < MAX_SIZE)
{
string str;
cout << "\nEnter the book ISBN: ";
cin >> books[size].ISBN;
cout << "Enter the author name: ";
cin >> books[size].Author;
cout << "Enter the book tile: ";
cin >> books[size].Title;
cin.get();
cout << "Enter the books quantity: ";
cin >> books[size].Quantity;
cout << "Enter the book price: $";
cin >> books[size].price;
size++;
cout << "You have successfully inserted an entry." << endl;
}
}
void choice5(book books[], int size)
{
for (int i = 1; i < size; i++)
{
book current = books[i];
int j = i;
while (j > 0 && (books[j - 1].Title).compare(current.Title) > 0)
{
books[j] = books[j - 1];
j--;
}
books[j] = current;
}
if (size != 0)
cout << "You have successfully sorted the array." << endl;
else
cout << "Array is empty. Read the data first." << endl;
}
void choice6(book books[], int& size)
{
if (size == 0)
cout << "Array is empty. Read the data first." << endl;
else
{
int isbn;
cout << "\nEnter the ISBN of the book: ";
cin >> isbn;
for (int i = 0; i < size; i++)
{
if (books[i].ISBN == isbn)
{
int j = i;
while (j < size - 1)
{
books[j] = books[j + 1];
j++;
}
size--;
break;
}
}
cout << "You have successfully deleted an entry." << endl;
}
}
void choice7(book books[], int size)
{
ofstream outFile;
outFile.open("finalData.dat");
for (int i = 0; i < size; i++)
{
outFile << "Book Number: " << (i + 1) << endl;
outFile << "ISBN: " << books[i].ISBN << endl;
outFile << "Author: " << books[i].Author << endl;
outFile << "Title: " << books[i].Title << endl;
outFile << "Quantity: " << books[i].Quantity << endl;
outFile << "Price: $" << books[i].price << endl << endl;
}
if (size != 0)
cout << "You have successfully printed the array." << endl;
else
cout << "Array is empty. Read the file first." << endl;
outFile.close();
}
// File: Boookstore.cpp
#include<iostream>
#include"Inventory.txt"
using namespace std;
int main()
{
const int MAX_SIZE = 100;
int size = 0;
int choice;
book books[MAX_SIZE];
do
{
cout << "1: Read inventory forn file" << endl;
cout << "2: Display Inventory" << endl;
cout << "3: Update an entry" << endl;
cout << "4: Add an entry" << endl;
cout << "5: Sort inventory" << endl;
cout << "6: Delete an entry" << endl;
cout << "7: Write inventory to file and exit" << endl;
cout << "Enter your choice: ";
cin >> choice;
switch (choice)
{
case 1:
choice1(books, size, MAX_SIZE);
break;
case 2:
choice2(books, size);
break;
case 3:
choice3(books, size);
break;
case 4:
choice4(books, size, MAX_SIZE);
break;
case 5:
choice5(books, size);
break;
case 6:
choice6(books, size);
break;
case 7:
choice7(books, size);
cout << "Thank you." << endl;
break;
default:
cout << "Invalid choice!" << endl;
}
cout << endl;
} while (choice != 7);
system("pause");
return 0;
}
我的读取文件与我的源文件位于同一文件夹中，但我不确定导致该问题的原因。我的阅读文件就是这样：
20451
My First Book
Mark Lusk
Pearson Publishing
40
45.34
9780316
Brown Family
Mason Victor
Little Brown
36
105.99
1349877
Story of My Life
Norah M Jones
CreateSpace Independent Publishing Platform
20
18
它应该占用文件的第一行并将其设置为我的结构的ISNB部分的int，但它只是告诉我它是一个常量。任何帮助表示赞赏！
答案 0 :(得分：2)
您不能#include数据文件。它将它视为代码的一部分 - 而且它显然不是有效的c ++。
#include "Inventory.txt"
您必须打开文件并使用ifstream等内容进行阅读。