如何在C++中搜索文本文件并打印行

#include <fstream>
#include <iostream>

int main() {
    std::ifstream file("example.txt");
    if (!file.is_open()) {
        std::cout << "Failed to open file." << std::endl;
        return 1;
    }

    // 继续实现搜索和打印行的逻辑
    // ...

    file.close();
    return 0;
}

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

int main() {
    std::ifstream file("example.txt");
    if (!file.is_open()) {
        std::cout << "Failed to open file." << std::endl;
        return 1;
    }

    std::string line;
    std::string target = "search_text";

    while (std::getline(file, line)) {
        if (line.find(target) != std::string::npos) {
            std::cout << line << std::endl;
        }
    }

    file.close();
    return 0;
}