从文本文件读取矩阵到二维整数数组 C++ [英] Reading matrix from a text file to 2D integer array C++

问题描述

1 3 0 2 4 
0 4 1 3 2 
3 1 4 2 0 
1 4 3 0 2 
3 0 2 4 1 
3 2 4 0 1 
0 2 4 1 3

我在 .txt 文件中有一个这样的矩阵.现在，如何以最佳方式将此数据读入 int** 类型的二维数组?我搜索了整个网络，但没有找到满意的答案.

I have a matrix like this in a .txt file. Now, how do I read this data into a int** type of 2D array in best way? I searched all over the web but could not find a satisfying answer.

array_2d = new int*[5];
        for(int i = 0; i < 5; i++)
            array_2d[i] = new int[7];

        ifstream file_h(FILE_NAME_H);

        //what do do here?

        file_h.close();

推荐答案

首先，我认为你应该创建一个大小为 7 的 int*[] 并在你在循环内初始化一个 5 的 int 数组.

First of all, I think you should be creating an int*[] of size 7 and looping from 1 to 7 while you initialize an int array of 5 inside the loop.

在那种情况下，你会这样做:

In that case, you would do this:

array_2d = new int*[7];

ifstream file(FILE_NAME_H);

for (unsigned int i = 0; i < 7; i++) {
    array_2d[i] = new int[5];

    for (unsigned int j = 0; j < 5; j++) {
        file >> array_2d[i][j];
    }
}

编辑(经过相当长的时间后):
或者，我建议使用 vector 或 array:

EDIT (After a considerable amount of time):
Alternatively, I recommend using a vector or an array:

std::array<std::array<int, 5>, 7> data;
std::ifstream file(FILE_NAME_H);

for (int i = 0; i < 7; ++i) {
    for (int j = 0; j < 5; ++j) {
        file >> data[i][j];
    }
}

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