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Ruby case statement – Find output programs (set 1)

Last Updated : December 15, 2025

Program 1

case 20
  when 10
    puts "TEN";
  when 20
    puts "TWENTY";
  when 30
    puts "THIRTY";
  when 40
    puts "FORTY";
  when 50
    puts "FIFTY";
  else
    puts "Unknown number";
end

Output

TWENTY

Explanation

In the above program, we created case blocks. Here, the case 20 matched based on the given value and printed the "TWENTY".

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Program 2

case (40-10)
    when 10
       puts "TEN"; 
    when 20
       puts "TWENTY"; 
    when 30
       puts "THIRTY"; 
    when 40
       puts "FORTY"; 
    when 50
       puts "FIFTY"; 
    else
        puts "Unknown number";    
end

Output

THIRTY

Explanation

In the above program, we created case blocks. Here case 30 matched based on the given value and printed the " THIRTY".

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Program 3

case 40
    when 80-10
       puts "SEVENTY"; 
    when 80-20
       puts "SIXTY"; 
    when 80-30
       puts "FIFTY"; 
    when 80-40
       puts "FORTY"; 
    when 80-50
       puts "THIRTY"; 
    else
        puts "Unknown number";    
end

Output

FORTY

Explanation

In the above program, we created case blocks. Here, the case 40 matched based on the given value and printed the "FORTY".

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Program 4

case 40
    else 
        puts "Unknown number";    
    when 10
       puts "TEN"; 
    when 20
       puts "TWENTY"; 
    when 30
       puts "THIRTY"; 
    when 40
       puts "FORTY"; 
    when 50
       puts "FIFTY"; 
end

Output

HelloWorld.rb:2: syntax error, unexpected keyword_else, expecting keyword_when
    else 
    ^~~~
HelloWorld.rb:4: syntax error, unexpected keyword_when, expecting end-of-input
    when 10
    ^~~~

Explanation

The above program will generate errors because we can use "else" at the end of the "case" statement only. The correct program is given below:

case 40
    when 10
       puts "TEN"; 
    when 20
       puts "TWENTY"; 
    when 30
       puts "THIRTY"; 
    when 40
       puts "FORTY"; 
    when 50
       puts "FIFTY"; 
    else 
        puts "Unknown number";    
end

# Output: FORTY

---

Program 5

case 43
    when 11..20
       puts "Number is within the range of 11 to 20"; 
    when 21..30
       puts "Number is within the range of 21 to 30"; 
    when 31..40
       puts "Number is within the range of 31 to 40"; 
    when 41..50
       puts "Number is within the range of 41 to 50"; 
    else 
        puts "Unknown number";    
end

Output

Number is within the range of 41 to 50

Explanation

In the above program, we created case blocks. Here, the case 41..50 matched the given number with range, and print the appropriate message.

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