如何在C ++中将文本文件读入向量？

Question

我正在尝试将包含9行单整数的文本文件读入向量。 VS Code不返回语法错误，但是当我调试程序时，在main下出现了分段错误（我在特定行上加了注释）。我的执行方式有问题吗？预先谢谢！

#include <iostream>
#include <vector>
#include <fstream>
#include <string>
using namespace std;
vector <int> list = {};

int count_line(){   //Count the number of accounts in the txt file
    int count = 0;
    string line;
    ifstream count_file;
    count_file.open("text.txt"); //The text file simply have 9 lines of single integers in it
    if (!count_file){
        cerr<<"Problem reading from file"<<endl;
        return 1;
    }
    while (!count_file.eof()){
        getline(count_file,line);
        count ++;
    }
    count_file.close();
    return count - 1;
}

int main(){
    int i{0};
    count_line();
    ifstream input {"text.txt"};
    if (!input){
        cout<<"Problem reading from file"<<endl;
        return 1;
    }
    while (i <= count_line() && count_line() > 0){
        input>>list[i]; //I am getting a segmentation fault error here
        i++;
    }
    for (int k = 0; k < 9 ; k++){
        cout<<list[k];
    }
}

Answer 1

使用之前必须分配元素。

解决方法之一：

    while (i <= count_line() && count_line() > 0){
        if (list.size() <= (size_t)i) list.resize(i + 1); // add this
        input>>list[i];