[C/C++]文件输入输出

C style

FILE * fileptr
filename="C:\\file.txt"
fopen

fclose

fprintf

C++ style

//指向std::ostream的指针
#include <iostream>
#include <fstream>

int main() {
    std::ostream* output = &std::cout;  // 默认指向控制台

    // 输出到控制台
    *output << "Hello, Console!" << std::endl;

    // 切换到文件
    std::ofstream file("output.txt");
    output = &file;
    *output << "Hello, File!" << std::endl;

    // 恢复控制台输出
    output = &std::cout;
    *output << "Back to Console!" << std::endl;

    file.close();
    return 0;
}