Data Type in C++:

Data Type in C++:

we store variable in computer memory. but computer has to know what kind of data we store in a variable. for this purpose we use data type that tell the computer what kind of data we are store in a variable.

There are 4 basic data types  :

• int

• char

• float

• double

int:

—used to declare numeric program variables of integer type whole numbers, positive and 

negative

—keyword: int

Range :

 signed: -2147483648 to 2147483647 

unsigned: 0 to 4294967295

Size     : 1byte

char: 

—equivalent to ‘letters’ in English language

—Example of characters:

—Numeric digits: 0 - 9

—Lowercase/uppercase letters: a - z and A - Z

—Space (blank)

—Special characters: , . ; ? “ / ( ) [ ] { } * & % ^ < > etc

—single character

—keyword: char

Range :

signed: -128 to 127

unsigned: 0 to 255

Size: 4 byte

Float:

—fractional parts, positive and negative
—keyword: float
Range    :+/- 3.4e +/- 38
Size        : 4 byte

Double:

—used to declare floating point variable of higher precision or higher range of numbers
exponential numbers, positive and negative
—keyword: double

Range    : +/- 1.7e +/- 308 
Size        :  8 byte