Solution: Consecutive Sums
Go over the implementation of finding consecutive numbers that sum a target number.
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Solution
print "Enter a number: "
input = gets.chomp.to_i
y = (input + 1) / 2
(1..y - 1).each do |starting_number|
(starting_number..y).each do |j|
sum = (starting_number..j).to_a.inject(0){ |sum, item| sum + item }
if sum == input
puts "#{input} = #{(starting_number..j).to_a.join(' + ')}"
break
end
end
end
Finding consecutive numbers that sum to a target number
Explanation
Line 9: Here,
starting_numberis the outer loop variable defined on line 6, andjis the inner loop variable defined on line 8.Let’s dry run it for
inputequal to, and yequal to...