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 |
Download Source Code

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