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How to Redirect cin and cout to Files in C++?
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How to Open and Close a File in C++?

Last Updated : 08 Feb, 2024
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In C++, we can open a file to perform read and write operations and close it when we are done. This is done with the help of fstream objects that create a stream to the file for input and output. In this article, we will learn how to open and close a file in C++.

Open and Close a File in C++

The fstream class contains the std::fstream::open() function that can be used to open files in different modes.

Syntax of fstream::open()

fstream_object.open(filename, mode);

The modes can be of three types:

  • std::ios::in: This mode is used to open a file for reading only.
  • std::ios::out: This mode is used to open a file for writing. If there is already content in the file then it will be overwritten in this mode.
  • std::ios::app: This mode is called the append mode in which we open a file for writing at the end of the file.

We can close the file using std::fstream::close() function.

Algorithm

1. We will first create an fstream object.
2. Then we open the file using open() function in write mode(ios::out)
2. We then write some data to the file.
3. At the end, we close the file using close() function

C++ Program to Open and Close a File

C++ 
// C++ program to demonstrate how to open and close a file #include <fstream> #include <iostream>  using namespace std;  int main() {     //  create and ofstream object and open the file in     //  append mode     ofstream fio("abc.txt", ios::app);      // Check if the file is opened successfully     if (fio.is_open()) {          cout << "File opened successfully." << endl;          // Append content to the file         fio << "This text is appended to the file." << endl;          // Close the file         fio.close();          cout << "File closed." << endl;     }     else {         // Display error if file was not opened         cout << "Error opening file!" << endl;     }      return 0; }

Output
File opened successfully.  File closed.

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How to Redirect cin and cout to Files in C++?
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gaurav472
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Article Tags :
  • C++ Programs
  • C++
  • cpp-file-handling
  • CPP Examples
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  • CPP

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