使用.open（）成员函数ifstream数组的错误访问代码C++

Question

我有这个相当简单的任务，其中我有两个文本文件与50名，我查询用户的文本文件“女孩名”或“男孩的名字”和名称，程序会检查用户输入的名称是否在他们选择的文件中。我想我已经知道了，但是当试图打开第二个文件时，我得到了一个错误的访问代码。我已经读过关于内存分配的问题，我认为这是我的代码问题，但答案超出了我的理解水平，所以我被卡住了。

#include <iostream> 
#include <fstream> 
#include <string> 

using namespace std; 

int main() { 

    // Declare Variables 

    ifstream inFile[1]; // male and female file streams 
    int inFileArrayVar = 0; // allows switching from female and male file streams 
    string gender; 
    string name[50]; 
    string inputName; 
    int popular = 0; 
    bool inputCondition = 1; 
    bool progLoop = 1; 

    // Welcome Message 
    cout << "*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o" << '\n' 
    << " WELCOME TO THE GENDER BINARY MACHINE" << '\n' 
    << "*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o*o" << '\n' << '\n' 

    << "Enter a name and see if it is one of the most popular Canadian female or male names in 2015. " << '\n' << '\n'; 

    // Open Files 

    inFile[0].open("GirlsNamesCanada2015.txt"); 
    inFile[1].open("BoysNamesCanada2015.txt"); 

    // User Query 

    while (inputCondition == 1){ 

    cout << "Choose to query either the male or female database by entering 'f' or 'm' " << '\n'; 
    cin >> gender; 

     if (gender == "f") { 
      cout << "You have selected the female name database. Enter the name you'd like to search: " << '\n'; 
      inFileArrayVar = 0; 
      inputCondition = 0; 
     } 
     else if (gender == "m"){ 
      cout << "You have selected the male name database. Enter the name you'd like to search: " << '\n'; 
      inFileArrayVar = 1; 
      inputCondition = 0; 
     } 
     else 
      inputCondition = 1; 
    } 

    while (progLoop == 1){ 

     cin >> inputName; 

    for (int i = 0; i < 50; i++) { 
     inFile[inFileArrayVar] >> name[i]; 
     if (inputName.compare(name[i]) == 0) { 
      popular = 1; 
      cout << inputName << " was one of the most popular names in 2015." << '\n' << '\n'; 
      i = 50; 
     } 
    } 
      if (popular == 0){ 
       cout << inputName << " was not one of the most popular names is 2015." << '\n' << '\n'; 
      } 

    cout << "If you want to contine, enter either 'f' or 'm', otherwise enter any other character. " << '\n'; 
     cin >> gender; 


     if (gender == "f"){ 
      cout << "You have selected the female name database. Enter the name you'd like to search: " << '\n'; 
      inFileArrayVar = 0; 
     } 
     else if (gender == "m"){ 
      inFileArrayVar = 1; 
      cout << "You have selected the male name database. Enter the name you'd like to search: " << '\n'; 
     } 
     else 
      progLoop = 0; 


    } 

    cout << "merci d'avoir choisi le GENDER BINARY MACHINE ******* pce out ******** " << '\n' << '\n'; 


    return 0; 
} 

Answer 1

ifstream inFile[1]; // male and female file streams 

在这里，你声明的一个元素的数组。这个数组有一个元素。这就是[1]在这里的意思。

inFile[0].open("GirlsNamesCanada2015.txt"); 
inFile[1].open("BoysNamesCanada2015.txt"); 

然后尝试访问数组中的元素＃0和元素＃1，这个元素数组中的第一个和第二个元素。什么可能会出错？

当声明的数组：

type array[n]; 

这意味着该数组包含元素＃0至元素＃N-1。