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Status Submitted
Workspace IBM i
Categories Languages - RPG
Created by Guest
Created on May 30, 2024

add a %round built-in function

While %inth and %dech exist, they only allow for half up rounding and don’t have an option to round to a negative number of decimal places (e.g. 123 => 120). The %dech built-in is kind of awkward because you always must specify the size and precision. Reaching out to SQL just to round is awkward. Adding a bunch of extra math to achieve the desired rounding behavior is error prone and awkward.

A designated round function would make RPG more ergonomic, similar to the recently added %upper and %lower functions.


The function signature could look something like this:
%round(numeric expression to round {: number of decimal place to round to {: rounding mode}})

The parameters 1 and 2 should behave like parameters of the scalar SQL function ROUND.
https://www.ibm.com/docs/en/i/7.5?topic=functions-round

Parameter 3 should allow us to override the rounding mode.
*up
*down
*floor
*ceil
*halfup
*halfdown
*halfeven
*halfodd


Maybe an alternative syntax that assumes 0 for the number of decimal places to round to could be allowed.
%round(numeric expression to round {: rounding mode})

For convenience the functions %ceil and %floor could also be added.


Here some examples:

%round(1.456) = 1
%round(1.456: 2) = 1.46
%round(1.456: 0: *ceil) = %ceil(1.456) = 2

%round(123: -1) = 120
%round(123: -1: *ceil) = 130
%round(127: -1) = 130


Here some similar implementations of the round function in other languages:
https://docs.python.org/3/library/functions.html#round
https://www.php.net/manual/en/function.round.php

Idea priority Medium