OS/2 Procedures Language 2/REXX


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DATATYPE




 >>---DATATYPE(string -+---------+-)------><
                       +--,type--+

DATATYPE determines whether 'data' is numeric or alphabetic and returns a 
result of NUM or CHAR. If only string is specified, the returned result is 
NUM if string is a valid REXX number (any format); otherwise CHAR will be 
the returned result. 
If type is specified, the returned result is 1 if string matches the type; 
otherwise, a 0 is returned. If string is null, 0 is returned (except when 
type is X, which returns 1). The following is a list of valid types. Only 
the capitalized letter is significant (all others are ignored). 
 Alphanumeric      Returns 1 if string contains only characters from the 
                   ranges a-z, A-Z, and 0-9. 
 Bits              Returns 1 if string contains only the characters 0 
                   and/or 1. 
 C                 Returns 1 if string is a mixed SBCS/DBCS string. 
 Dbcs              Returns 1 if string is a pure DBCS string. 
 Lowercase         Returns 1 if string contains only characters from the 
                   range a-z. 
 Mixed case        Returns 1 if string contains only characters from the 
                   ranges a-z and A-Z. 
 Number            Returns 1 if string is a valid REXX number. 
 Symbol            Returns 1 if string contains only characters that are 
                   valid in REXX symbols. Note that both uppercase and 
                   lowercase letters are permitted. 
 Uppercase         Returns 1 if string contains only characters from the 
                   range A-Z. 
 Whole number      Returns 1 if string is a REXX whole number under the 
                   current setting of NUMERIC DIGITS. 
 heXadecimal       Returns 1 if string contains only characters from the 
                   ranges a-f, A-F, 0-9, and blank (so long as blanks only 
                   appear between pairs of hexadecimal characters). Also 
                   returns 1 if string is a null string. 
 

 DATATYPE(' 12 ')         ->   'NUM'
 DATATYPE('')             ->   'CHAR'
 DATATYPE('123*')         ->   'CHAR'
 DATATYPE('12.3','N')     ->    1
 DATATYPE('12.3','W')     ->    0
 DATATYPE('Fred','M')     ->    1
 DATATYPE('','M')         ->    0
 DATATYPE('Fred','L')     ->    0
 DATATYPE('?20K','S')     ->    1
 DATATYPE('BCd3','X')     ->    1
 DATATYPE('BC d3','X')    ->    1
 
   

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