Files Theory

In C, each file is simply a sequential stream of bytes. Our programs are stored in files.
Text Files – are also called stream oriented data files. In these files the data is written as stream of characters & it is read as stream of characters.

Operations:

• Writing in a file 
• Reading from a file

 There are four steps to execute write/read operations.

• Establishing a buffer area
• Open file
• Write into file / Read from file 
• Close file

File handling in C

• In C we use FILE * to represent a pointer to a file.
• fopen is used to open a file.  It returns the special value NULL to indicate that it couldn't open the file.

     FILE *P;

Modes for opening files : click here