Standard File IO Stream : Input-Output Streams in C Programming

File I/O Streams in C Programming Language :

1. In C all input and output is done with streams
2. Stream is nothing but the sequence of bytes of data
3. A sequence of bytes flowing into program is called input stream
4. A sequence of bytes flowing out of the program is called output stream
5. Use of Stream make I/O machine independent.

Predefined Streams :

stdin	Standard Input
stdout	Standard Output
stderr	Standard Error

Standard Input Stream Device :

1. stdin stands for (Standard Input)
2. Keyboard is standard input device .
3. Standard input is data (Often Text) going into a program.
4. The program requests data transfers by use of the read operation.
5. Not all programs require input.

Standard Output Stream Device :

1. stdout stands for (Standard Output)
2. Screen(Monitor) is standard output device .
3. Standard output is data (Often Text) going out from a program.
4. The program sends data to output device by using write operation.

Difference Between Std. Input and Output Stream Devices :

Point	Std i/p Stream Device	Standard o/p Stream Device
Stands For	Standard Input	Standard Output
Example	Keyboard	Screen/Monitor
Data Flow	Data (Often Text) going into a program	data (Often Text) going out from a program
Operation	Read Operation	Write Operation

Some Important Summary :

Point	Input Stream	Output Stream
Standard Device 1	Keyboard	Screen
Standard Device 2	Scanner	Printer
IO Function	scanf and gets	printf and puts
IO Operation	Read	Write
Data	Data goes from stream	data comes into stream