c++ - 如何在 C++ 中将空格和换行符分隔的整数读入二维数组？

Question

我有一个 .txt 文件，其中包含由空格分隔的数字(在本例中均小于 100)，行中以换行符分隔。像这样:

 41 53 07 91 44
 52 17 13 03 21

我想将这些数字读入一个二维数组，就像它们出现的那样，这样数组的列就用空格分隔，行就换行。

我可以让它以字符串的形式读取行，但是我在分离出单个数字并将它们视为整数时遇到了麻烦。

Answer 1

试试这个:

#include <vector>
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>

int main()
{
    // The result of the read is placed in here
    // In C++, we use a vector like an array but vectors can dynamically grow
    // as required when we get more data.
    std::vector<std::vector<int> >     data;

    // Replace 'Plop' with your file name.
    std::ifstream          file("Plop");

    std::string   line;
    // Read one line at a time into the variable line:
    while(std::getline(file, line))
    {
        std::vector<int>   lineData;
        std::stringstream  lineStream(line);

        int value;
        // Read an integer at a time from the line
        while(lineStream >> value)
        {
            // Add the integers from a line to a 1D array (vector)
            lineData.push_back(value);
        }
        // When all the integers have been read, add the 1D array
        // into a 2D array (as one line in the 2D array)
        data.push_back(lineData);
    }
}