File Handling Program

Overview

This C program demonstrates fundamental file operations including creating, reading, writing, and appending data to files.

Features

• Create Files: Create new empty files
• Write Files: Write content to files (overwrites existing content)
• Read Files: Read and display file contents
• Append Files: Add content to the end of existing files

File Structure

task 1/
├── file handling.c      # Main source code
├── file handling.exe    # Compiled executable
└── README.md           # This documentation

Compilation

gcc "file handling.c" -o "file handling.exe"

Usage

Run the executable and follow the menu-driven interface:

1. Create a new file: Creates an empty file with the specified name
2. Write to a file: Writes content to a file (overwrites existing content)
3. Read from a file: Displays the current contents of a file
4. Append to a file: Adds content to the end of an existing file
5. Exit: Terminates the program

Example Workflow

1. Choose option 1 to create a new file (e.g., "test.txt")
2. Choose option 2 to write initial content to the file
3. Choose option 3 to read and verify the content
4. Choose option 4 to append additional content
5. Choose option 3 again to see the updated content
6. Choose option 5 to exit

Technical Details

• Language: C
• Libraries: stdio.h, stdlib.h, string.h
• Buffer Size: 1000 characters for content input
• File Modes:
  • "w" for write/create operations
  • "r" for read operations
  • "a" for append operations

Error Handling

The program includes error checking for:

• File creation failures
• File opening errors for read/write/append operations
• Invalid menu selections

Notes

• Files are created in the same directory as the executable
• Maximum content length per operation is 999 characters
• The program uses fgets() for safe string input handling