FAQ: Control Flow in Ruby - If

This community-built FAQ covers the “If” exercise from the lesson “Control Flow in Ruby”.

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print “How many Children do you have?”
user_num = Children(gets.chomp)

if user_num < 0
puts “Sorry, you are not eligble for children’s free pass!”
elsif user_num > 0
puts “congrtulations, you are eligble for children’s free pass!”
else user_num = 0
puts “sorry, you are not elible for children’s free pass!”
end

Please help, what am i doing wrong here?

Not aware of any Children() method in Ruby.

print "How many children do you have? "
user_num = gets.chomp
1 Like

Hi, this is the answer I get:

How many children do you have?3
comparison of String with 0 failed

I think i am missing a string to link number of children up?

gets means literally, get string which means the user input is a string value.

 if user_num.to_i > 0

 if user_num.to_i < 0

 if user_num.to_i == 0
1 Like

I just figured it out.
I was missing Integer
user_num = Integer(gets.chomp)

1 Like

Thank you for your prompt response and help!

1 Like

stock = 10

if stock < 1
puts “We are out of stock!”
end

I copied this example from rubyguides into the editor but it always replies: It looks like you didn’t print anything to the console.
Can someone help?

10 is not less than 1.

Therefore the if expression evaluates to false and nothing gets printed.

If I wanted the result to be, “You picked a prime number!”, how would I word the IF statement?

Ruby has a ? operator/method?

if n.prime?

end

Oops. Not working. Will need to do some reading.

Well, it is described as a method of the Integer class so must be a newer addition than the Ruby version in the LE.

1 Like

Okay, thanks for your reply. Much appreciated! (It’s not that big a deal— mostly just me being “Curious George.”)

I was trying to write an if/else statement such that it asked for the user to enter a score (presumably from a hypothetical test).
If the score was > 70, it would print, “Well done! You passed the test.”
If the score was < 70, it would print, “You have not passed. Better luck next time!”
But I must have missed something somewhere because it wouldn’t run.

1 Like

What happens when it is exactly 70? Shouldn’t that be a pass, as well.

if s >= 70    =>  Pass
else          =>  Fail
end
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Yes, that’s the other “else”. X= 70, and x > 70 are both Pass. X < 70 is a Fail.

But clearly I have goofed up somewhere because it doesn’t even run. Alas. I just get the “Oops! Something must have gone wrong" error message.

But my “What is your name?” program worked, so… maybe I can copy over bits of that one, eh.

Thanks for your help!

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Careful not to complicate things. Go for the bare minimum, as described above. ‘if…else’. You are only looking for one condition, a pass. The rest fall to the default, else.

1 Like

Yes! The >= 70 was the missing piece. I hadn’t learned the “greater than or equal to” code yet. Now, of course, a lesson or two later, it’s easy.

Much appreciated!

1 Like