C Programming Files I/O

Why files are needed?

  • When a program is terminated, the entire data is lost. Storing in a file will preserve your data even if the program terminates.
  • If you have to enter a large number of data, it will take a lot of time to enter them all.
    However, if you have a file containing all the data, you can easily access the contents of the file using few commands in C.
  • You can easily move your data from one computer to another without any changes.

Types of Files

When dealing with files, there are two types of files you should know about:
  1. Text files
  2. Binary files

1. Text files

Text files are the normal .txt files that you can easily create using Notepad or any simple text editors.
When you open those files, you'll see all the contents within the file as plain text. You can easily edit or delete the contents.
They take minimum effort to maintain, are easily readable, and provide least security and takes bigger storage space.

2. Binary files

Binary files are mostly the .bin files in your computer.
Instead of storing data in plain text, they store it in the binary form (0's and 1's).
They can hold higher amount of data, are not readable easily and provides a better security than text files.

File Operations

In C, you can perform four major operations on the file, either text or binary:
  1. Creating a new file
  2. Opening an existing file
  3. Closing a file
  4. Reading from and writing information to a file

Working with files

When working with files, you need to declare a pointer of type file. This declaration is needed for communication between the file and program.
FILE *fptr;

Opening a file - for creation and edit

Opening a file is performed using the library function in the "stdio.h" header file: fopen().
The syntax for opening a file in standard I/O is:
ptr = fopen("fileopen","mode")
For Example:
fopen("E:\\cprogram\\newprogram.txt","w");

fopen("E:\\cprogram\\oldprogram.bin","rb");

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