Modern C for Absolute Beginners: A Friendly Introduction to the C Programming Language

© Slobodan Dmitrović 2021

S. DmitrovićModern C for Absolute Beginnershttps://doi.org/10.1007/978-1-4842-6643-4_29

29. File Input and Output

Slobodan Dmitrović¹  

(1)

Belgrade, Serbia

 

A file is an array of bytes, usually stored on mediums such as drives. We can write to and read from a file using a few C standard-library functions. The following sections explain the workflow and the functions used.

29.1 File Input

To be able to read from a file, we need to utilize a couple of functions. The workflow is as follows:

• Open a file for reading using the fopen function.

• Read a line of text from a file using the fgets function.

• Close the file using the fclose function when done.

Let us first create a text file called myfile.txt and fill it with arbitrary text. ...