'How to tell users how many years they have left till 21

What I am trying to do is tell the your how many years they have left till there 21. I have been trying to think of it but nothing.

Here is my code:

#!/usr/bin/env ruby

under_age = 21

print "What is your first name? "
first_name = gets.chomp

print "What is your last name? "
last_name = gets.chomp

print "What is your age? "
user_age = Integer(gets.chomp)

if user_age < legal_age
    print "You may not continue"
else if > 21
    print "Welcome!"
rubyalgorithm


Solution 1:[1]

You set this at the beginning:

under_age = 21

But then you don't use it, you use legal_age I think if you change the first line to 

legal_age = 21

and then drop the last less-than like:

if user_age < legal_age
  years_to_wait = 21 - user_age
  print "You may not continue, come back in #{years_to_wait} year#{years_to_wait > 1? 's' : ''} "
else
  print "Welcome!"
end

I added a little bit there that you may have not covered being new to Ruby. Just to be clear:

#{years_to_wait} inside of a double quote string (" vs ') prints out as the value of the variable. If the variable is 1, then the response would be the singular "year", if greater than 1 it would be plural "years". I used the very compact version of if/then/else to make it clean (called the Ternary operator).

The first part is the comparison followed by the ? for an implied "if" 

years_to_wait > 1?

followed by the return value if true which is the character 's' then a ":" and the return value if false, no character ''. That gets us the correct version of the word "year(s)" when the interpolation happens.

Solution 2:[2]

Your variable names are all over the place. But I think you just want 

legal_age - user_age

Also your last if is unnessary

Solution 3:[3]

You miss the variable in the elsif statement in ruby it should look:

if user_age < 21
    print "You may not continue"
elsif user_age > 21
    print "Welcome!"
end

the legal_age variable is also not assigned, maybe you mean the under_age variable instead.

Solution 4:[4]

your if..else syntax is not proper. for more info 

if user_age < under_age
    print "You may not continue, come back after #{under_age - user_age} years"
else
    print "Welcome!"
end

Note: legal_age is also not assigned, you can replace it with under_age or change under_age to legal_age

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 karina
Solution 3 ebimanuel
Solution 4

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