Using the "fopen" function, open the file and assign "file" to the variable.
Check to see if the variable == NULL indicates that the file was successfully opened.
To write or read from the file, use the fprintf or fscanf functions.
Creating a new file:
Open a file in read mode with the r command. w - in write mode, opens or creates a text file. a - adds a new line to a file in append mode. r+ - opens a file in read-only and write-only mode. a+ - opens a file in read-only and write-only modes.
Reading a Document:
The most basic function for reading a single character from a file is int fgetc(FILE * fp); The fgetc() function reads a character from the input file specified by fp. The character read is returned as the return value, or EOF if an error occurs.
Three steps are required to read from or write to simple text files:
Using fopen, open the file.
Use fscanf to read from the file or fprintf to write to it.
fclose is a command that closes a file.
The write system call writes data from a buffer defined by the user in the programme into the file supplied by the calling process, in bytes as specified by the caller. The Write system call is used by most current operating systems when a programme has to write data to a file stored in a filesystem.
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