c++中如何读取文本文件的内容_c++文件读取操作的常见方法总结

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

int main() {
    std::ifstream file("example.txt");
    std::string line;

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

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

    file.close();
    return 0;
}

#include <fstream>
#include <string>
#include <iterator>

std::ifstream file("example.txt");
std::string content((std::istreambuf_iterator<char>(file)),
                     std::istreambuf_iterator<char>());

std::ifstream file("example.txt", std::ios::binary);
file.seekg(0, std::ios::end);
size_t size = file.tellg();
std::string content(size, '\0');
file.seekg(0, std::ios::beg);
file.read(&content[0], size);

std::ifstream file("data.txt");
std::string word;
while (file >> word) {
    std::cout << word << std::endl;
}

std::ifstream file("example.txt");
if (!file) {
    std::cerr << "文件不存在或无法访问！" << std::endl;
    return -1;
}