Question

我是C ++的初学者，我目前正在尝试将头围在数组上。我有一个作业，需要从csv文件中读取数据，将其存储到结构化数组中，然后要求用户输入城市名称。基于该城市名称，我需要输出该城市的信息。输入城市名称时出现问题，返回的信息不正确。我似乎无法正确解决。任何对此的指导和对我要去哪里的解释将不胜感激。

csv文件上的小信息块：

State,City,FAA,IATA,ICAO,Airport,Role,Enplanements
ALABAMA,Birmingham,BHM,BHM,KBHM,Birmingham–Shuttlesworth International Airport,S,1335215
ALABAMA,Dothan,DHN,DHN,KDHN,Dothan Regional Airport,N,48423
ALABAMA,Huntsville,HSV,HSV,KHSV,Huntsville International Airport (Carl T. Jones Field),S,505541
ALABAMA,Mobile,MOB,MOB,KMOB,Mobile Regional Airport,N,287661
ALABAMA,Montgomery,MGM,MGM,KMGM,Montgomery Regional Airport (Dannelly Field),N,157958

这是我到目前为止写的：

#include <iostream>
#include <iomanip>
#include <cstring>
#include <string>
#include <fstream>
using namespace std;

struct airplane_Data
{
    string state;
    string city;
    string faa;
    string iata;
    string icao;
    string airport_Name;
    string role;
    string enplanements;
};

const int C = 8; // Columns: Name of sections
const int MAX = 350; //Rows: 348 Airports

int main()
{
    bool reset;
    int menu;
    string input;
    ifstream read_Data;
    airplane_Data airplane[C][MAX];

    do
    {
    reset = true;
    read_Data.open("Airports.csv");

    if ("Airports.csv")
    {
        cout << "File \"Airports.csv\" opened successfully. ";
        cout << endl;
        system("pause"); system("cls");
    }
        if (!"Airports.csv")
        {
            cout << "Error Openning \"Airports.csv\"";
            cout << endl;
            system("pause"); exit(0);
        }

        cout << "---------------Main Menu---------------" << endl << endl;
        cout << "1.Search for airport by city name." << endl;
        cout << "2.Exit Program" << endl << endl;

        cout << "Please select a choice for the menu above: "; 
        cin >> menu; 
        cin.ignore();

        //Store data into a Structured Array
        for (int a = 0; a < C; a++)
        {
            for (int i = 0; i < MAX; i++)
            {
                getline(read_Data, airplane[a][i].state, ',');
                getline(read_Data, airplane[a][i].city, ',');
                getline(read_Data, airplane[a][i].faa, ',');
                getline(read_Data, airplane[a][i].iata, ',');
                getline(read_Data, airplane[a][i].icao, ',');
                getline(read_Data, airplane[a][i].airport_Name, ',');
                getline(read_Data, airplane[a][i].role, ',');
                getline(read_Data, airplane[a][i].enplanements, ',');
            }
        }

        switch (menu)
        {
        case 1:
            for (int a = 0; a < C; a++)
            {
                for (int i = 1; i < MAX; i++)
                {

                    cout << "Enter city name to find information on an airport: ";
                    getline(cin, airplane[a][i].city);

                    cout << "Here is information on the cities airport." << endl << endl;

                    cout << left << setw(15) << "State: " << airplane[a][i].state << endl;
                    cout << left << setw(15) << "City: " << airplane[a][i].city << endl;
                    cout << left << setw(15) << "FAA Code: " << airplane[a][i].faa << endl;
                    cout << left << setw(15) << "IATA Code: " << airplane[a][i].iata << endl;
                    cout << left << setw(15) << "ICAO Code: " << airplane[a][i].icao << endl;
                    cout << left << setw(15) << "Airport Name: " << airplane[a][i].airport_Name << endl;
                    cout << left << setw(15) << "Role: " << airplane[a][i].role << endl;
                    cout << left << setw(15) << "Enplanements: " << airplane[a][i].enplanements << endl;

                }
            }
        }

    } while (reset == true);

    read_Data.close();

    return 0;
}

Answer 1

问题是您没有正确阅读Enplanements字段。它是换行符，而不是逗号，因为它是该行的最后一个字段。结果是您正在阅读换行符，并包括下一行的城市名称。在第二行中，您将在州名中读取城市名称，并且在每一行中您将获得更多不同步的信息。

将该行更改为：

getline(read_Data, airplane[a][i].enplanements, '\n');

有关更多想法，请参见groupby

根据用户输入搜索结构化数组

1 个答案: