# Binary Constants

A binary constant is an alternative way to represent a numeric constant. A binary constant takes one of the following forms:

B'd[d...]'

B"d[d...]"

d | Is a binary (base 2) digit (0 or 1).

You can specify up to 128 binary digits in a binary constant.

## Examples

Valid Binary Constants
`B'0101110'`
`B"1"`

Invalid Binary Constants
`B'0112'` | The character 2 is invalid.
`B10011'` | No apostrophe after the B.
`"1000001"` | No B before the first quotation mark.

Parent topic: Binary, Octal, Hexadecimal, and Hollerith Constants

## See Also

Alternative Syntax for Binary, Octal, and Hexadecimal Constants