File operation functions

1. fopen()   : Opens a new/existing file

2. fwrite() : Writes an unformatted data to file

3. fprintf()  :  Prints a formatted value to a file

4. fread() : To read the data from a file

5. fclose() : Closes the file

User Defined Functions:

Function: Set of reusable statements is called function which has to return something.

Syntax:

vuser_init()
{
Return 0;
}

Note: Dividing you script statements into multiple functions is called modular approach

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