Session 2 : Briefing

Session Two :

Data Types

Integer ( Decimal, Octal, Hexademimal ) {Signed , Unsigned}
Floating
Double
Character

Range of the data types depends on machine. So, we have written a program to find the range which is shared at later stage.

Examples for different data types are discussed in class.

Variables :

How to define a variable?

datatype v1,v2,v3..;

Initialisation :

datatype variable_name = data;

Here, variable name is an alias to backend memory, data is stored in that memory location.

Formatted input output functions /*Unformatted functions are dealt in previous class */

Unformatted i/o function:

getchar() : Reads character from keyboard , waits for user to type character and then enter keyboard
getch() : Reads a character from keyboard and doesnt wait for enter key.
getche() : Reads a character from keyboard and doesnot wait for user to type enter key. Character enter will be echoed.
gets() : Reads a string from keyboard and waits for user to type ENTER key.
putchar() / putch() : To echo character on screen
puts() : Echos string on screen.

Formatted function:

Data Types with Format specifier.

int :

%d --> Data into decimal signed integer
%u --> Data into decimal unsigned integer
%o --> Data into octal integer
%x / %X --> Data into Hexademimal integer
%h --> Data into short integer

float :

%f --> Data into floating point value
%e / %E --> Data into floating point exponential value

double :

%lf / %Lf : Data into LONG floating point value

char :

%c --> Converts data into character
%s --> Converts data into string