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Odd or even numbers

pavpav
pavpav ✭
in RobotStudio
Hi

I would like to check if a value is odd or even, does anyone have a good solution for this in RAPID?

I know its possible to divide a value by 2 and count the amount of decimals, but i cannot find a function that can count decimals.

Thank you

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  • blind3rr
    blind3rr ✭
       
        FUNC num OddEven(num x)
            VAR num nAux;
            
            nAux := Trunc(x) MOD 2;
            TEST nAux
            CASE 0:
                ! Value is even
                RETURN 2;
            CASE 1:
                ! Value is odd
                RETURN 1;
            ENDTEST
        ENDFUNC

    Something like this?
        

    Benteler Maschinenbau CZ
  • pavpav
    pavpav ✭
    Thx

    I read about MOD and the way i see it is that it counts the amount of numbers a value consists of?

    11/5 is 2,2 so MOD will be 2 because there is two numbers?
  • B_Baan
    B_Baan ✭
    You clearly don't understand MOD yet, but you know it's function.

    This page contains an explanation of the mathematics behind the MOD (A.K.A. Modulo) instruction:


    Hope this helps
  • pavpav
    pavpav ✭
    Ah thx the remainder after a quotient
  • Kristo
    Kristo ✭
    One way is to check first bit of the number. If the bit is 1 than the number is odd, if it's 0, the number is even. Example code:


    !I converted the num to dnum, than it's possible to check higher value number than 0...255.

    FUNC bool checkIsNumberOddOrNot(num inputNum)
           VAR dnum inputDnum;
           
           inputDnum:=numToDnum(inputNum);
           
           IF BitCheckDnum(inputDnum, 1) = TRUE THEN
               !first bit is true, it's an odd number
               RETURN TRUE;
           ELSE
               !first bit is false, it's not an odd number
               RETURN FALSE;
           ENDIF

       ENDFUNC



    Br,
    Kristo

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