C++读取文本文件以填充二维数组

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

void readTextFile(std::vector<std::vector<int>>& array, const std::string& filename) {
    std::ifstream file(filename);
    if (file.is_open()) {
        std::string line;
        while (std::getline(file, line)) {
            std::vector<int> row;
            std::istringstream iss(line);
            int num;
            while (iss >> num) {
                row.push_back(num);
            }
            array.push_back(row);
        }
        file.close();
    } else {
        std::cout << "Unable to open file: " << filename << std::endl;
    }
}

int main() {
    std::vector<std::vector<int>> array;
    std::string filename = "input.txt"; // 替换为实际的文件名

    readTextFile(array, filename);

    // 打印填充后的二维数组
    for (const auto& row : array) {
        for (const auto& num : row) {
            std::cout << num << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}