Constants in C

Constants  in  C :

C has four basic type of constants

·       Integer constants

·       Floating point constants

·       Character constants

·       String constants

Integer Constant :

        An integer constant is an integer valued number. Thus, it consist of sequence of numbers .

        Integer constants can be written in three different number system :

·       Decimal(base 10)

·       Octal(base 8)

·       Hexadecimal(base 16)

·       Binary(base 2)

A decimal integer consist of any combination of digits taken from set 0 to 9.

Example of valid decimal integer constants :

·       0

·       1

·       743

·       32767  etc.

An octal number constant can consist of digits taken from set 0 to 7.

The first digit must be 0 in order to identify the number as octal.

Examples of octal integer constants:

·       01

·       0743

·       077777   etc.

A hexa decimal integer constant must begin with either 0x or 0X .

It can be followed by any combination of digits taken from set 0 t0 9 and A to F.

Examples of hexadecimal integer constant :

·       0x

·       0X1

·       0X7FFF

·       0xabcd    etc…

The magnitude of integer constants range from zero to some maximum value.the typical max value is 32767 .

The unsigned integer constant can be identified by appending the letter U or u to the end of the constant.

Example :

·       5000U(decimal unsigned)

·       077777U(octal unsigned)

·       0X50000U(hexadecimal unsigned)

Long integer constants can be identified by letter L or l at the end of constant.

Example:

·       123456789L(decimal long)

·       0123456L(octal long)

An unsigned long integer can be identified by appending the letter UL to end of constant.

Example:

·       12345678UL(decimal unsigned long)

·       0XFFFFFUL(hexadecimal unsigned long)

Lets continue the other constant types in the next post….

Link to previous post:https://iamafutureprogrammer.blogspot.com/

Thank you ….