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Float-->Integer

Slawa

Hello 

At me a simple question. How to receive from number with a floating point an integer if at number with a floating point there is no fractional part that is;
X=10.5
Y=20.5
Z=Y-X=10.0 <---- how to make so that Z was whole. Z=10

 The case when X and Y always with a floating point and result of their subtraction always an integer interests. And necessity of it has arisen for function use oddp (Z) which analyzes only integers.

 

Regards

Slawa 

  • Your question is not very clear.

    You are looking for one of the following function : 

     ceiling, floor, fix, round, truncate ?

    Take a look to the skill Language Reference Manual : sklangref.pdf.

    Regards,

     

  •  Yes this that is necessary. Thank you very much. And to look at a manual there is no possibility for technical reasons.

     

    Best regards

    Slawa 

  • Since floating point numbers are not always perfectly represented on a computer, you might need to account for 9.999999 or 10.0000001 as being the same as 10.0. You could handle it like this:

    procedure(floatToInt(num)
        if(abs(round(num)-num) < 0.000001 then
            round(num)
        else
            num
        )
    )

    This will return an integer if the floating point is within 0.000001 of an integer and otherwise it will return the original float.

    floatToInt(10.0)
    10 
    floatToInt(10.1)
    10.1
    type(floatToInt(10.1))
    flonum
    type(floatToInt(10.0))
    fixnum
    type(floatToInt(10.00000001))
    fixnum

    Derek

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