Why is division in Ruby returning an integer instead of decimal value

Question

For example   9   5     gt  1   but I expected 1 8  How can I get the correct decimal  non-integer  result  Why is it returning 1 at all

User · Answer

There is also the Numeric fdiv method which you can use instead   9 fdiv 5      gt  1 8

User · Answer

It   s doing integer division  You can use to f to force things into floating-point mode   9 to f   5     gt  1 8 9   5 to f     gt  1 8   This also works if your values are variables instead of literals  Converting one value to a float is sufficient to coerce the whole expression to floating point arithmetic

User · Answer

Fixnum to r is not mentioned here  it was introduced since ruby 1 9  It converts Fixnum into rational form  Below are examples of its uses  This also can give exact division as long as all the numbers used are Fixnum     a   1 to r     gt   1 1    a   10 to r    gt   10 1    a   a   3      gt   10 3    a   a   3      gt   10 1    a to f         gt  10 0   Example where a float operated on a rational number coverts the result to float   a   5 to r      gt   5 1   a   a   5 0     gt  25 0

User · Answer

It   s doing integer division  You can make one of the numbers a Float by adding  0   9 0   5     gt  1 8 9   5 0     gt  1 8

User · Answer

You can include the ruby mathn module   require  mathn    This way  you are going to be able to make the division normally   1 2                 gt   1 2   1 2     3          gt   1 8  1 3 3               gt  1 Math sin 1 2        gt  0 479425538604203   This way  you get exact division  class Rational  until you decide to apply an operation that cannot be expressed as a rational  for example Math sin

User · Answer

You can check it with irb     irb  gt  gt  2   3   gt  0  gt  gt  2 to f   3   gt  0 666666666666667  gt  gt  2   3 to f   gt  0 666666666666667

User · Answer

Change the 5 to 5 0  You re getting integer division

[ruby] Why is division in Ruby returning an integer instead of decimal value?

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