DavidRails
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| # 練習：請印出從 1 到 100 之間所有的單數。 | |
| array_1_to_100=[*1..100] | |
| array_1_to_100_odd=array_1_to_100.select{|a| a%2==1} | |
| p array_1_to_100_odd | |
| # 練習：請印出從 1 到 100 之間所有的單數的總和。 | |
| sum=0 | |
| for i in 1..100 do |