计算小数点前的零 [英] Count Zeroes before the Decimal Point

问题描述

我正在尝试计算小数点前有多少个零.

I am trying to count how many zeroes are a before a decimal.

 private void textBox1_TextChanged(object sender, EventArgs e)
        {
            decimal x = 0;

            if (Decimal.TryParse(textBox1.Text, out x))
            {
                var y = 1000000;
                var answer = x * y;

                displayLabel2.Text = (x.ToString().Replace(".", "").TrimStart(new Char[] { '0' }) + "00").Substring(0, 2);



            }
            else
            {
                displayLabel2.Text = "error";
            }
        }

当我插入(比方说)7.2 时，我得到一个显示 72 的输出，这正是我想要的.现在我需要另一个显示器.最初的 7.2 乘以 1000000.所以它的报价是 7,200,000.00.现在我需要知道如何计算小数点前的 5 个零并为此显示 5.然后，如果我要做 0.72.我的 Quotent 是 720,000.00.我需要为 4 个零显示 4.等等.然后我需要将该数字输出到 displayLabel5.Text

When I plug in (lets say) 7.2 I get an output that displays 72, which is what I want. Now I need another display. That initial 7.2 is being multiplied by 1000000. So the quotent of that would be 7,200,000.00. Now I need to some how count the 5 zeroes before the decimal point and display 5 for that. Then if I were to do .72. My Quotent would be 720,000.00. And I would need to display 4, for the 4 zeroes. And so on. Then I need to output that number to displayLabel5.Text

推荐答案

这是一行 Linq 您可以尝试计算小数点前的零.您可以先Split() 按小数，然后执行Where().Count() 以获得零的数量.

Here's a one line Linq you could try to count zeroes before the decimal. You can Split() first by the decimal then perform a Where().Count() to get the number of zeros.

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        string myString = (720000.00).ToString();
        Console.WriteLine(myString.Split('.')[0].Where(d => d == '0').Count());
    }
}

结果:

4

演示

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