C语言

#include <stdio.h>

int main() {
    // 写文本文件
    FILE* textFile = fopen("example.txt", "w");
    if (textFile) {
        fprintf(textFile, "Hello, this is a text file!\n");
        fclose(textFile);
    } else {
        perror("Failed to open text file for writing");
    }

    // 读文本文件
    textFile = fopen("example.txt", "r");
    if (textFile) {
        char buffer[100];
        while (fgets(buffer, sizeof(buffer), textFile)) {
            printf("%s", buffer);
        }
        fclose(textFile);
    } else {
        perror("Failed to open text file for reading");
    }

    // 写二进制文件
    FILE* binaryFile = fopen("example.bin", "wb");
    if (binaryFile) {
        int data = 42;
        fwrite(&data, sizeof(data), 1, binaryFile);
        fclose(binaryFile);
    } else {
        perror("Failed to open binary file for writing");
    }

    // 读二进制文件
    binaryFile = fopen("example.bin", "rb");
    if (binaryFile) {
        int data;
        fread(&data, sizeof(data), 1, binaryFile);
        printf("Read from binary file: %d\n", data);
        fclose(binaryFile);
    } else {
        perror("Failed to open binary file for reading");
    }

    return 0;
}

C++

#include <iostream>
#include <fstream>

int main() {
    // 写文本文件
    std::ofstream textOutFile("example.txt");
    if (textOutFile.is_open()) {
        textOutFile << "Hello, this is a text file!\n";
        textOutFile.close();
    } else {
        std::cerr << "Failed to open text file for writing\n";
    }

    // 读文本文件
    std::ifstream textInFile("example.txt");
    if (textInFile.is_open()) {
        std::string line;
        while (std::getline(textInFile, line)) {
            std::cout << line << '\n';
        }
        textInFile.close();
    } else {
        std::cerr << "Failed to open text file for reading\n";
    }

    // 写二进制文件
    std::ofstream binaryOutFile("example.bin", std::ios::binary);
    if (binaryOutFile.is_open()) {
        int data = 42;
        binaryOutFile.write(reinterpret_cast<char*>(&data), sizeof(data));
        binaryOutFile.close();
    } else {
        std::cerr << "Failed to open binary file for writing\n";
    }

    // 读二进制文件
    std::ifstream binaryInFile("example.bin", std::ios::binary);
    if (binaryInFile.is_open()) {
        int data;
        binaryInFile.read(reinterpret_cast<char*>(&data), sizeof(data));
        std::cout << "Read from binary file: " << data << '\n';
        binaryInFile.close();
    } else {
        std::cerr << "Failed to open binary file for reading\n";
    }

    return 0;
}