Ruby/sam.rb at j2115 - JD2021student/Ruby

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Ruby / sam.rb

YOSHIMURA Nana on 6 Sep 2021 160 bytes 2021-09-06 21:13:12

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#!/usr/bin/env ruby
# coding: utf-8
print("いくつまでの合計を数えますか。\n")
n=gets.to_i
sam=0
while n>0
  sam+=n
  n-=1
end
printf("%d\n",sam)