编程之美---1的个数C#笨（效率低）方法实现

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编程之美—1的个数C#笨（效率低）的方法实现

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class Program
{
    static void Main(string[] args)
    {
        Program p = new Program();
        Console.WriteLine(p.count_1_in_a_bounch_of_nums(13));
        Console.Read();
    }

    public int count_1_in_a_num(int num)
    {
        int count = 0;
        while (num != 0)
        {
            count += (num % 10) == 1 ? 1 : 0;
            num /= 10;
        }

        return count;
    }

    public int count_1_in_a_bounch_of_nums(int end)
    {
        int count = 0;
        for (int i = 1; i <= end; i++)
        {
            count += count_1_in_a_num(i);
        }

        return count;
    }
}