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Using "Case" control in JRuby
Posted on: September 30, 2008 at 12:00 AM

In the previous section of JRuby tutorial you have learned to use for-loop in JRuby.

Using "Case" control in JRuby

In the previous section of JRuby tutorial you have learned to use for-loop in JRuby. Now we will discuss that how to use "Case" control in our program to provide working of program on selected case values.

This example program takes user's choice by the user to perform operations on numbers then it takes two numbers to perform operation on them. We have taken input values with the use of "gets". Sample syntax for "Case" control is as follows:

Syntax of Case is as follows:

case choice
    choiceNo 1
statements...
................
choiceNo 2
   statements...
................
   choiceNo 3
   statements...
................
end

Here is the full example code of JRubyCaseExample.rb as follows:

JRubyCaseExample.rb

# Using case in JRuby

print "<=== Use of case in JRuby ===>\n"
print "******Select your choice*******\n"
print " 1. Add \n"
print " 2. Substract \n"
print " 3. Multiply \n"
print " 4. Divide \n"
print "====> Choice :"
choice = gets
   print "Enter First Number =: "
   n1=gets
   print "Enter Second Number =: "
   n2=gets
case choice.to_i
when 1
puts " Addition is =: #{n1.to_i + n2.to_i}"
   when 2
puts " Subtraction is =: #{n1.to_i - n2.to_i}"
   when 3
puts " Multiplication is =: #{n1.to_i * n2.to_i}"
   when 4
puts " Division is =: #{n1.to_i / n2.to_i}"
end

To execute this JRuby example type jruby command with filename JRubyCaseExample.rb and you will get the following output:

Output:

On selecting choice 1(Addition) will be performed on entered two numbers:

C:\JRuby>jruby JRubyCaseExample.rb
<=== Use of case in JRuby ===>
******Select your choice*******
1. Add
2. Subtract
3. Multiply
4. Divide
====> Choice :1
Enter First Number =: 2
Enter Second Number =: 3
Addition is =: 5

When we will select 2( Subtraction), program will perform subtraction on both numbers and result will be shown as

C:\JRuby>jruby JRubyCaseExample.rb
<=== Use of case in JRuby ===>
******Select your choice*******
1. Add
2. Substract
3. Multiply
4. Divide
====> Choice :2
Enter First Number =: 3
Enter Second Number =: 5
Substraction is =: -2

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