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Ruby case statement – Find output programs (set 1)

This section contains the Ruby case statements find output programs (set 1) with their output and explanations.
Submitted by Nidhi, on February 12, 2022

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".

---

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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