null created by barbchoy - https://repl.it/Br7J/2382

sum_nums.rb

# Write a method that takes in an integer `num` and returns the sum of
# all integers between zero and num, up to and including `num`.
#
# Difficulty: easy.

def sum_nums(num)
  sum=0
  i=0
  while i<num+1
  sum=sum+i
  i+=1
end
return sum
end

# These are tests to check that your code is working. After writing
# your solution, they should all print true.

puts("\nTests for #sum_nums")
puts("===============================================")
    puts('sum_nums(1) == 1: ' + (sum_nums(1) == 1).to_s)
    puts('sum_nums(2) == 3: ' + (sum_nums(2) == 3).to_s)
    puts('sum_nums(3) == 6: ' + (sum_nums(3) == 6).to_s)
    puts('sum_nums(4) == 10: ' + (sum_nums(4) == 10).to_s)
    puts('sum_nums(5) == 15: ' + (sum_nums(5) == 15).to_s)
puts("===============================================")