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Calculating factorial in JRuby
Posted on: September 29, 2008 at 12:00 AM

In the previous section of "Running first JRuby program" example you must be aware with the way to run JRuby program.

Calculating factorial in JRuby

In the previous section of "Running first JRuby program" example you must be aware with the way to run JRuby program. Now in this example you will know to "Calculate Factorial in JRuby".

In this example we have defined a function factorial( number) which takes the number as argument for which factorial is to be evaluated. Variable "n" will consists of the evaluated result finally and we can print the result by calling function factorial(). Here is the example code for calculating factorial in JRuby as follows:

JRubyFactorail.rb

require "java"
# Define method factorial
   def factorial(n)
if n = = 0
   1
   else
n * factorial(n-1)
   end
end
# Printing factorial of 5
puts factorial(5).to_i

Output:

C:\JRuby>jruby JRubyFactorial.rb
120

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