C++ fstream File Creation Guide

In C++, we can use the fstream library to create a file. The specific steps are as follows:

1. Header file.

#include <fstream>

1. Create an fstream object, which can be an ifstream (for reading files), ofstream (for writing files), or fstream (for both reading and writing).

std::ofstream file("filename.txt");

1. Write content to the file. You can use the stream operator “<<" to write content.

file << "Hello, World!";

1. Close the file. It is necessary to close the file after writing to or reading from it.

file.close();

The complete sample code is as follows:

#include <fstream>

int main()
{
    // 创建一个ofstream对象，用于写入文件
    std::ofstream file("filename.txt");

    // 写入内容到文件
    file << "Hello, World!";

    // 关闭文件
    file.close();

    return 0;
}

This will create a file named “filename.txt” and write “Hello, World!” into it.