Conflicting if-statements in Ruby

Question

I tried running this code in an online IDE supporting Ruby 1.8.7, and the elsif statement isn't being recognized; e.g., if I type in "85", it still returns "Over-Weight".

def prompt
 print ">> "
end

puts "Welcome to the Weight-Calc 3000! Enter your weight below!"

prompt; weight = gets.chomp()

if weight > "300" 
 puts "Over-weight"
elsif weight < "100"
 puts "Under-weight"
end

However when I run the following, it works just fine:

def prompt
 print ">> "
end

puts "Welcome to the Weight-Calc 3000! Enter your weight below!"

prompt; weight = gets.chomp()

if weight > "300" 
 puts "Over-weight"
elsif weight > "100" && weight < "301"
 puts "You're good."
end

Any idea on how I can fix this?

Answer 1

The problem is that you try to compare strings which are evaluated from left to right, not like numbers.

Convert them to integers (or floats), and compare them.

weight = Integer(gets.chomp())

if weight > 300
 puts "Over-weight"
elsif weight < 100
 puts "Under-weight"
end

Answer 2

With

if weight > "300"

you are comparing two strings.

It should be

if weight.to_i > 300