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Asked: 2026-06-04T04:22:45+00:00

Possible Duplicate: Ruby Refuses to Divide Correctly I am using Ruby on Rails 3.2.2

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Possible Duplicate:
Ruby Refuses to Divide Correctly

I am using Ruby on Rails 3.2.2 and when I try to calculate 10 * (50 / 100) I got back 0 but when I make 10 * 50 / 100 I got back 5.

For technical reasons, I can not use the latter since my code is like the following:

perc = 50 /100

# Some code that uses the 'perc' variable
... = method_name(perc)

return 10 * perc

What should I make to solve the problem and have 5 (not 5.0 or something else; that is, so that the returns is an Integer)?

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1 Answer

  1. Editorial Team

    50 / 100 is 0 because you are using integer division. The result is truncated to an integer.

    Performing the multiplication first works because then the division gives a whole number.

    You could perform the calculation using floats instead of integers: 50.0 / 100.0 == 0.5, then round the result to an integer at the end of the calculation.

    proportion = 50.0 / 100.0
result = (10 * proportion).round
return result

    See it working online: ideone

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