🔵 Core C++ · Lesson 36

File Handling in C++

What is File Handling in C++?

File Handling in C++
File handling allows programs to read and write data permanently using files. C++ provides ifstream, ofstream and fstream.

Level
🔵 Core C++ Features

Example File
file-handling.cpp

Main Focus
Concept + syntax + practical C++ program

Why should you learn this?

It helps you write correct and readable C++ programs.
It is used repeatedly in school practicals, projects and competitive programming.
It builds the base for advanced topics such as OOP, STL and data structures.

Important Terms

Term	Meaning / Use
ifstream	Ifstream used in File Handling in C++ programming.
ofstream	Ofstream used in File Handling in C++ programming.
fstream	Fstream used in File Handling in C++ programming.
file	File used in File Handling in C++ programming.
stream	Stream used in File Handling in C++ programming.

Syntax / Pattern

ofstream fout("file.txt"); fout << data;

Example Program

#include <iostream>
#include <fstream>
using namespace std;
int main(){
    ofstream fout("result.txt");
    fout << "Marks: 95";
    fout.close();
    cout << "File written";
    return 0;
}

Expected Output

File written

Program Explanation

ofstream opens file for writing.
close() releases the file resource.

Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

saving reports
student records
logs

Common Mistakes

Not checking whether file opened successfully.
Using wrong file path.

Practice Tasks

Write student marks to a file.
Read file line by line using getline.

Summary

File Handling in C++ is an important C++ topic. Learn the definition, understand the syntax, run the example program and then solve the practice tasks to make the concept strong.