digit?,letter?,space?

Usage

digit? c
letter? c
space? c

Signature

digit?,letter?,space?:

% $\to$ Boolean

Parameter	Type	Description
c	%	a character

Returns

digit?(c) returns true if c is in the range '0'-'9', false otherwise, while letter?(c) returns true if c is in the range 'a'-'z' or the range 'A'-'Z', false otherwise and space?(c) returns true if c is a blank space, i.e.a space or a tab, false otherwise.