File Processing

File is a collection of record 
• Record is a collection of field
• Field is a block of byte

-      • Byte is collection of bit

•TEXT FILE is saved in a text format or ASCII File.

The syntax is : 

File *fp = fopen ("file_name","value");

Fp is a saving place for file ( it's function is similar with scanf in stdio.h library)

Fopen is use to open file, if some errors occured it will return to 0.

Possible mode value that often used:

“r”  opening a file to be read.

  “w”  creating a file to be written.

  “a”  opening a File for data append.

  “r+”  opening a File for read/write.

  “w+”  creating file for read/write.

  “a+”  opening a File for read/append

  “rb”    opening a File (binary) to be read.

  “wb”  creating a file (binary) for write operation

Before using the data, file should be opened using fopen(fp).
After using the data, file should be closed using fclose(fp).

Syntax to input file:
1. fgets
2. fscanf
3. fread

Syntax to output file:
1. fwrite
2. fputs
3. fprintf