按字符C ++读取文件 [英] Read files by character C++

问题描述

我想用数字读取一个文件
ex：

I wanted to read a file with numbers ex:

2
2 3 
2 3 4 
5 6 7

3 
2 2
1 2 
2 3 

我使用getline（）函数，并将结果存储在向量（字符串）中。但是，当我访问向量中的元素时，存储了具有空格的整行。我想通过数字存储元素（数字表示一个矩阵）

I used the getline () function and I store the results in a vector (string). However, when I access the elements in the vector, the entire line with spaces were stored. I wanted to store elements by number (the numbers represent a matrix)

推荐答案

#include<fstream>
#include<iterator>
#include<vector>

int main(int, char*[])
{
    std::ifstream file("numbers.txt");
    std::vector<int> data((std::istream_iterator<int>(file)),
                          std::istream_iterator<int>());
}

会给你一个整数的向量。

will give you a vector of integers.

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