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Ruby has a built in function round() which allows us to both change floats to integers, and round floats to decimal places. round() with no argument will round to 0 decimals, which will return an integer type number. Using round(1) will round to one decimal, and round(2) will round to two decimals.
The div() function in Ruby returns the integer division of two numbers.
Integer division ( // ) The integer division operation // is used when you want your answer to be in whole numbers. Since it is very common for the result of dividing two integers to be a decimal value, in Python3 integers, division rounds the result to the lower bound.
It’s doing integer division. You can use to_f to force things into floating-point mode:
9.to_f / 5 #=> 1.8
9 / 5.to_f #=> 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.
It’s doing integer division. You can make one of the numbers a Float by adding .0:
9.0 / 5 #=> 1.8
9 / 5.0 #=> 1.8
There is also the Numeric#fdiv method which you can use instead:
9.fdiv(5) #=> 1.8
You can check it with irb:
$ irb
>> 2 / 3
=> 0
>> 2.to_f / 3
=> 0.666666666666667
>> 2 / 3.to_f
=> 0.666666666666667
You can include the ruby mathn module.
require 'mathn'
This way, you are going to be able to make the division normally.
1/2 #=> (1/2)
(1/2) ** 3 #=> (1/8)
1/3*3 #=> 1
Math.sin(1/2) #=> 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.
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