OS/2 Procedures Language 2/REXX


Inf-HTML [About][Toc][Index] 0.9b (c) 1995 Peter Childs


NUMERIC





 >>--NUMERIC-----+--DIGITS-+-------------+---------+--;--><
                 |         +-expression--+         |
                 +--FORM--+----------------------+-+
                 |        +-SCIENTIFIC-----------+ |
                 |        +-ENGINEERING----------+ |
                 |        +-+-------+-expression-+ |
                 |          +-VALUE-+              |
                 +--FUZZ--+--------------+---------+
                          +--expression--+


The NUMERIC instruction is used to change the way in which arithmetic 
operations are carried out. The options of this instruction are described 
in detail in the OS/2 Procedures Language 2/REXX Reference. 
NUMERIC DIGITS controls the precision to which arithmetic operations and 
arithmetic built-in functions are evaluated. If expression is omitted, 
then the default value of 9 is used.  Otherwise the result of the 
expression is rounded, if necessary, according to the current setting of 
NUMERIC DIGITS. The value used must be a positive whole number that is 
larger than the current NUMERIC FUZZ setting. 
There is no limit to the value for DIGITS (except the amount of storage 
available), but note that high precisions are likely to require a good 
deal of processor time. It is recommended that you use the default value 
wherever possible. 
You can retrieve the current setting of NUMERIC DIGITS with the DIGITS 
built-in function 
NUMERIC FORM controls the form of exponential notation used by REXX for 
the result of arithmetic operations and arithmetic built-in functions. 
This may be either SCIENTIFIC (in which case only one, nonzero digit 
appears before the decimal point), or ENGINEERING (in which case the power 
of ten is always a multiple of three). The default is SCIENTIFIC. The FORM 
is set either directly by the subkeywords SCIENTIFIC or ENGINEERING or is 
taken from the result of evaluating the expression following VALUE. The 
result in this case must be either SCIENTIFIC or ENGINEERING. You can omit 
the subkeyword VALUE if the expression does not begin with a symbol or a 
literal string (for example, if it starts with a special character, such 
as an operator or parenthesis). 
You can retrieve the current setting of NUMERIC FORM with the FORM 
built-in function 
NUMERIC FUZZ controls how many digits, at full precision, are ignored 
during a numeric comparison operation. If expression is omitted, the 
default is 0 digits.  Otherwise expression must evaluate to 0 or a 
positive whole number rounded, if necessary, according to the current 
setting of NUMERIC DIGITS before it is used. The value used must be a 
positive whole number that is smaller than the current NUMERIC DIGITS 
setting. 
FUZZ temporarily reduces the value of DIGITS by the FUZZ value before 
every numeric comparison operation. The numbers being compared are 
subtracted from each other under a precision of DIGITS minus FUZZ digits 
and this result is then compared with 0. 
You can retrieve the current NUMERIC FUZZ setting with the FUZZ built-in 
function 
Note:    The three numeric settings are automatically saved across 
         subroutine and internal function calls.  See the CALL instruction 
         for more details.   

Inf-HTML End Run - Successful