Conditional statements in Ruby Programming Language

Conditional statements excute on satisfaction of condition/expression.
Following are conditional statements

1. If statement
2. Unless statement
3. If else statement
4. Else if statement

1.If Statement

• syntax:
• if <conditon>
• statements
• end
• example:
• execute the statements if condition evaluate to true
• conditon value is false or nil => it won't execute
• zero is also true in ruby language

•  a = 5
   if a == 4
     a = 7
   end
   print a # prints 5 since the if-block isn't executed

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•      short form for above code

a=1 flag = 1 flag = 0 if a == 0 puts flag

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2.If else Statement

• Syntax

          if <condition>
            <ifstatements>
        else
           <elsestatements>
        end

• Example

a = 0 if a==0 puts 'a is zero' else puts 'a is nonzero' end

• description
• Execute <ifstatements>block if condition evaluate to tru
• otherwise executes <elsestatements>block
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