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Whole number check


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  #1  
Old October 29th, 2012, 12:47 PM
KevinFCTwente KevinFCTwente is offline
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Whole number check
Is there an easy way to check if the result of a calculation (bv 10 / 9 or 10 / 5) is a whole number or not?
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Old October 29th, 2012, 01:01 PM
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Code:
if (fmod((double)numerator,(double)denominator))
  fputs("NOT ",stdout);
puts("whole");
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Old October 29th, 2012, 01:44 PM
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Quote:
Originally Posted by KevinFCTwente
Is there an easy way to check if the result of a calculation (bv 10 / 9 or 10 / 5) is a whole number or not?


The result of integer division (as in your exemple) (except division by zero) is ALWAYS an integer.
The result of floating-point division (except division by zero and overflows) is always a floating-point number.

If you want to determine if a floating point number has the same value as a whole number, that's another problem:
for instance 4.2E-289 is not a whole number (zero?) but 4.2E289 is a whole number.
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Old October 29th, 2012, 01:50 PM
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In simple math...

if (numerator == (numerator/denominator)*denominator) then the result of numerator/denominator is a whole number ;
else it isn't ;
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