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+--- Thread: Operator MOD (/showthread.php?tid=1195)
Operator MOD - Chris - 11-27-2022
Hello
How to replace MOD to get correct results.
I have been using the MOD for a long time without problems. The problems started with negative values.
(-1 MOD 5) => (-1)
(-1.4 MOD 5) => (-1)
(1.4 MOD 5) => (1)
(-7. MOD 5) => (-2)
(-7.1 MOD 5) => (-2)
All results are incorrect.
Regards - Chris
RE: Operator MOD - Pete - 11-27-2022
Chris, what am I missing?
Code: (Select All)
PRINT " Equation Result -1=True | 0=False"
PRINT
PRINT "(-1 MOD 5) >= (-1)", (-1 MOD 5), (-1 MOD 5) >= (-1)
PRINT "(-1.4 MOD 5) >= (-1)", (-1.4 MOD 5), (-1.4 MOD 5) >= (-1)
PRINT "(1.4 MOD 5) >= (1)", (1.4 MOD 5), (1.4 MOD 5) >= (1)
PRINT "(-7 MOD 5) >= (-2)", (-7 MOD 5), (-7 MOD 5) >= (-2)
PRINT "(-7.1 MOD 5) >= (-2)", (-7.1 MOD 5), (-7.1 MOD 5) >= (-2)All equations produce true results.
MOD utilizes integer division and reports the remainder.
Pete
RE: Operator MOD - Chris - 11-27-2022
This is another operator that will give the correct results?
Chris
RE: Operator MOD - SMcNeill - 11-27-2022
What do you consider to be correct results?
5 MOD 5 = 0
4 MOD 5 = 4
3 MOD 5 = 3
2 MOD 5 = 2
1 MOD 5 = 1
0 MOD 5 = 0
-1 MOD 5 = 4
-2 MOD 5 = 3
-3 MOD 5 = 2
-4 MOD 5 = 1
-5 MOD 5 = 0
-6 MOD 5 = 4
-7 MOD 5 = 3
^Is that the patten/results you're looking for?
If so, then just do something simple like:
FUNCTION ModAll&& (number as _INTEGER64, number2 AS LONG)
temp&& = number MOD number2
IF temp&& < 0 THEN temp&& = temp&& + number
ModAll = temp&&
END FUNCTION
RE: Operator MOD - Chris - 11-27-2022
That's exactly what I mean.
It cannot be done without the function ?.
Chris
RE: Operator MOD - Pete - 11-27-2022
MOD often require some user adjustments, such as coding a function, to fit specific desired patterns.
As far as a different keyword to get what want, none that I'm aware of.
Pete
RE: Operator MOD - Chris - 11-27-2022
To the creators of QB64. Can we expect in the near future that a new operator to solve this type of computation will be planted into QB64?
Chris
RE: Operator MOD - mnrvovrfc - 11-27-2022
But Steve's function is good enough, why try to force a BASIC dialect into a "new" implementation of a function that is mathematically sound?
RE: Operator MOD - bplus - 11-27-2022
Here it is without a new function:
Code: (Select All)
DefInt A-Z
n = 5
For i = 10 To -10 Step -1
If i < 0 Then
copy = i
While copy < 0
copy = copy + n
Wend
Print copy Mod n
Else
Print i Mod n
End If
NextRE: Operator MOD - SMcNeill - 11-27-2022
(11-27-2022, 08:30 PM)Chris Wrote: To the creators of QB64. Can we expect in the near future that a new operator to solve this type of computation will be planted into QB64?
Chris
I doubt it. What you're seeing is just the nature of MOD. Sometimes you just have to roll your own functions, if the built in ones don't fulfill all your needs.