Practice_Atcoeder Ruby_learning

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gets.chomp.to_i method can't use four arithmetic operations(f.e add, subtract).

so, if you want to use those, must change to gets.split.map(&:to_i) insted of gets.chomp.to_i.

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The method that name is case(when) can omitted in 1 line.

case gets.chomp when "A"
puts "B" else
puts "C" end

into

puts gets.chomp == 'A'? 'B':'C'

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Array method can't use this method gets.chomp.split.map(&:to_i), but you can use this method get.split.map(&:to_i).←this method allows you to put params into each array.

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Different for in each in how to use these method.
・former gets the element's number but later gets element's object. So, if you want to use the objects, you have to use later one. And then assign it into variable. Check it whether it is assigned into variable using command p .