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実装方法
小数部分を抜き出すには truncatingRemainder(dividingBy:)メソッド を使います。
次のように書くことで、１で割ったあまり、つまり小数部分を抜き出すことが可能です。
let number = 12.345
let decimal = number.truncatingRemainder(dividingBy: 1)
print(decimal) // 0.345
