[Main]
Name=isdigit
Type=Function
Subtype=Macro
Header Files=ctype.h
Definition=short isdigit (short c);
Real Definition=#define isdigit(c) ({register short __c=(c);__c>='0'&&__c<='9';})

[Description]
Checks whether a character is a digit.

[Explanation]
isdigit returns nonzero if <I>c</I> is a digit ('0' to '9'), otherwise it returns zero.
It is a small inline function which is implemented using GNU C smart macros.
