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# C Integer Constants

An integer constant refers to a sequence of digits without decimal point.

#### Rule for constructing integer constants are :

1. An integer constant must have at least one digit .
2. An integer constant contains neither a decimal point nor an exponent.
3. Commas and blank Spaces cannot be included within the number.
4. Sign ( + or – ) must precede the number .
5. Default sign is positive .
6. The allowable range for integer constants for a 16 bit computer is – 32768 to + 32767

There are three type of integer constants , namely , decimal , octal and hexadecimal.

( a ) Decimal integers consists of a set of digits 0 through 9 .

Example : The following are valid decimal integer constants

18                    – 11                    +39            0              8752

On the other hand , the following are not valid integer constants

28.0              contains a decimal point

12,250          contains a comma

5-                  Sign does not precede

40 20            Blank spaces are not allowed

( b )  An octalinteger constant consists of any combination of digits from 0 through 7 , with a leading 0.

Example : The following are valid octal integer Constants

015          0375           0            0764            05

( c )   A hexadecimal integer constant consists of any combination of digits from 0 through 9 or alphabets a ( or A ) through f ( or F ) , with a leading 0x or 0X .

Example : The following are valid hexadecimal integer constants

0x5           0x7ab          0x6f          0xabc        0x975

We generally use decimal integer constant or simply integer constant in programming.

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