Files in C

1. Files in C
Md. Shafiuzzaman
Lecturer, Dept. of CSE, JUST

2. File
• a container in computer storage devices used for storing data

3. 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.
• You can easily move your data from one computer to another without
any changes.

4. Types of Files
Text files
• Extension: .txt
• Can be created using any simple
text editors such as Notepad
• Contains plain text
Binary files
• Extension: .bin
• store data in the binary form (0's
and 1's)

5. File Operations
a) Creating a new file
b) Opening an existing file
c) Closing a file
d) Reading from and writing information to a file

6. Declaration
FILE *fptr;

7. Opening a file
fopen("fileopen","mode");

8. Opening Modes in Standard I/O
• r, rb
• w, wb
• a, ab

9. Closing a File
fclose(fptr)

10. Reading and writing to a text file
• fprint()
• fscanf()

11. Write to a text file

12. Read from a text file