图书信息管理系统C++

实验要求：

 实验代码；

#include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
#include <fstream>
#include <iomanip>
#include <ctype.h>
using namespace std;
//图书结构体
struct Book {
    double price;
    char name[50];
    char Locate[15];
}book[200];
int sum = 0;
int flag = 0;
string path = "book.txt";
//写入文件函数 将更新后的数据写入指定文件
void Out_to_File()
{
    int n = 0;
    ofstream file;

    file.open(path, ios::out | ios::trunc);

    if (!file.is_open())
    {
        cout << "You have failed to open the file!" << endl;
        exit(1);
    }
    while (n < sum)
    {
        file << book[n].Locate << "\t" << book[n].name << "\t" << book[n].price << endl;
        n++;
    }
    file.close();
}
//读取文件函数 将txt文件中的数据导入结构体
void Read_File()
{
    int n = 0;
    char first_line[200];
    char second_line[200];
    ifstream myfile(path, ios::in);
    if (!myfile.is_open())
    {
        cout << "Sorry You Have Failed to Open the File!" << endl;
        exit(1);
    }
    else
    {
        myfile.getline(first_line, 200);
        myfile.getline(second_line, 200);
        while (!myfile.eof())
        {
            myfile >> book[n].Locate >> book[n].name >> book[n].price;
            n++;
        }
    }
    sum = n;
    cout << "一共有" << sum << "个图书的信息" << endl;
    myfile.close();
    flag = 1;
    cout << "You have read the file successfully！" << endl;
}
//显示函数 将图书信息打印在显示屏上
void Display_Information() {
    if (!flag) {
        cout << "\t\t当前未录入图书信息，请先录入。\n" << endl;
        exit(0);
    }
    else {
        cout << "\t书号\t\t\t\t书名\t\t\t\t价格" << endl;
        for (int i = 0; i < sum; i++)
        {
            cout << book[i].Locate << "\t\t\t" << book[i].name << "\t\t\t" << book[i]