Real constants and functions: Difference between revisions

=={{header|Crystal}}==

<lang ruby>x = 3.25

y = 4

puts x.abs # absolute value

puts x.floor # floor

puts x.ceil # ceiling

puts x ** y # power

puts

include Math # without including

puts E # puts Math::E -- exponential constant

puts PI # puts Math::PI -- Archimedes circle constant

puts TAU # puts Math::TAU -- the correct circle constant, >= version 0.36

puts sqrt(x) # puts Math.sqrt(x) -- real square root

puts log(x) # puts Math.log(x) -- natural logarithm

puts log10(x) # puts Math.log10(x) -- base 10 logarithm

puts log(x, y) # puts Math.log(x, y) -- logarithm x base y

puts exp(x) # puts Math.exp(x) -- exponential

puts E**x # put Math::E**x -- same

</lang>

{{0ut}}<pre>

3.25

3.0

4.0

111.56640625

2.718281828459045

3.141592653589793

6.283185307179586

1.8027756377319946

1.1786549963416462

0.5118833609788744

0.8502198590705461

25.790339917193062

25.79033991719306

</pre>