A.6 Float
decimals
A.6.1 Math Operations for the Float Class
Standard operations are similar to those for the Integer class. The only exception is the / operator which returns fractional results.
12 / 5 # => 2
12.0 / 5.0 # => 2.4
12 / 5.0 # => 2.4
12.0 / 5 # => 2.` A.6.2 ** Float operator
Float ** Float ⇒ Float
The **operator for Floats can additionally be used to calculate roots.
9 ** 0.5 # => 3.0, since 9^(1/2) = sqaureroot of 9
8 ** (1/3.0) # => 2.0, since 8^(1/3) = cuberoot of 8 A.6.3 .round
Float#round ⇒ Integer
or
Float#round(Integer) ⇒ Float
- Returns the whole part (
Integer) of a decimal when not given any argument.
- When given an argument, returns a
Floatrounded to the number of decimal places specified by the argument.
3.14159.round # => 3
3.14159.round(3) # => 3.142
3.14139.round(3) # => 3.141
A.6.4 .to_i (Float)
Float#to_i ⇒ Integer
Converts a float to an integer by rounding the float down to closest whole number.
Returns an Integer
"8.9".to_i
8
"8.1".to_i
8