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@hmae12

【Ruby】10進数 ⇔ n進数の変換

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n進数の文字列を10進数の数値へ変換する → String#to_iメソッド

# 2進数を10進数に変換
puts '101'.to_i(2)
#=> 5

# 5進数を10進数に変換
puts '144'.to_i(5)
#=> 49

# 16進数を10進数に変換
puts 'FA'.to_i(16)
#=> 250

10進数の数値をn進数の文字列へ変換する → Integer#to_s

# 10進数を2進数に変換
puts 1010.to_s(2)
#=> '1111110010'

# 10進数を8進数に変換
puts 1010.to_s(8)
#=> '1762'

# 10進数を16進数に変換
puts 1010.to_s(16)
#=> '3F2'

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