File: isnum.doc

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\DOC isnum

\TYPE {isnum : string -> bool}

\SYNOPSIS
Tests if a one-character string is a decimal digit.

\DESCRIBE
The call {isnum s} tests whether the first character of string {s} (normally
it is the only character) is a decimal digit.

\FAILURE
Fails if the string is empty.

\SEEALSO
isalnum, isalpha, isbra, issep, isspace, issymb.

\ENDDOC