C++逐行读取文件方法详解

std::ifstream file("example.txt");
if (!file.is_open()) {
    std::cerr << "无法打开文件！" << std::endl;
    return -1;
}

std::string line;
while (std::getline(file, line)) {
    // 处理每一行内容
    std::cout << line << std::endl;
}

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

int main() {
    std::ifstream file("data.txt");
    if (!file) {
        std::cerr << "打开文件失败！" << std::endl;
        return 1;
    }

    std::string line;
    while (std::getline(file, line)) {
        std::cout << line << std::endl;
    }

    file.close(); // 可选：析构时会自动关闭
    return 0;
}