c++ - 从 .txt 文件读取整数到 vector ？

Question

出于某种原因，当我尝试从 txt 文件中读取时， vector 中的值为零。

这是我的代码:

int main(){
    ifstream read("problem13.txt");
    vector<int> source;
    int n;

    while (read >> n){
        source.push_back(n);
    }

    for (int i = 0; i < source.size(); i++)
        cout << source[i];

   cout << "Finished.";

}

txt文件比较长，但是格式是:3710728753390210279879799822083759024651013574025046376937677490009712648124896970078050417018260538743249861995247410594742333095130581237266173096299194221336357416157252243056330181107240615490825023067588207539346171171980310421047513778063246676

Answer 1

下面是一一阅读:

#include <fstream>
#include <iostream>
#include <vector>

using namespace std;

int main(){
    ifstream read("e:\\problem13.txt");
    vector<int> source;
    char n;

    while (read >> n){
        source.push_back(n - '0');
    }

    for (int i = 0; i < source.size(); i++)
        cout << source[i];

   cout << endl << "Size: " << source.size() << endl << "Finished.";

}

但我建议您逐行阅读，或者如果文件不是那么大，则全部阅读 std::string 并处理字符串(从文件中读取很昂贵)。