Write a program that prints the numbers from 1 to 100. But for multiples of three print “Foo” instead of the number and for the multiples of five print “Bar”. For numbers which are multiples of both three and five print “FooBar”.

foobar.rb

# version 1

for counter in 1..100
  if (counter % 3 == 0) && (counter % 5 == 0)
	puts 'FooBar'
  elsif (counter % 3 == 0)
  	puts 'Foo'
  elsif (counter % 5 == 0)
  	puts 'Bar'
  else
  	puts counter
  end
end

# version 2

counter = 1
while counter <= 100
  if (counter % 3 == 0) && (counter % 5 == 0)
	puts 'FooBar'
  elsif (counter % 3 == 0)
  	puts 'Foo'
  elsif (counter % 5 == 0)
  	puts 'Bar'
  else
  	puts counter
  end
  counter += 1
end

# nerd version

(1..100).each { |number|
 op = []
 if number%3==0
  op.push("Foo")
 end
 if number%5==0
  op.push("Bar")
 end
 puts op.size > 0 ? op.join("") : number.to_s
}

wow