如何用特定参数计算零 [英] How to count zeroes with specific parameters

问题描述

我需要计算零的数量.到目前为止，此代码有效:

I need to count an amount of zeroes. So far this code works:

 private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (uFCheckBox.Checked == true)
            {
                nFCheckBox.Checked = false;
                pFCheckBox.Checked = false;
                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);

                    string myString = answer.ToString();
                     // displayLabel5.Text = myString.Split('.')[0].Where(d => d == '0').Count().ToString();
                    displayLabel5.Text = myString.Split('.')[0].Where(d => d == '0').Count().ToString();

                }

当我输入数字(如72、47、83等)时，它完美地计数为零.但是，一旦我输入以零结尾的数字，它便会将其计数为零.我需要一些在前两位数字之后都算为全零的东西.所以50 x 1,000,000将是50,000,000.但我不需要计算前2位数字，因此在这种情况下我需要它输出6. 更多示例:

It counts zero perfectly when I input numbers like 72, 47, 83, etc. But once I input numbers that end with a zero, it counts that zero. I need something that counts all zeroes after the first 2 digits. So 50 x 1,000,000 will be 50,000,000. but I dont need to count the first 2 digits, so I need it to output 6 in this scenario. More example:

1.0 x 1,000,000 = 1,000,000 - I only need to output 5 zeroes
0.10 x 1,000,000 = 100,000 - I only need to output 4 zeroes.

但是我还需要保持一点，如果我输入其他不以零结尾的数字，它仍然可以正确计数. 例子:

But I also need to maintain that if I input other numbers that dont "end" in zeroes it still counts properly. Examples:

72 x 1,000,000 = 72,000,000 - Needs to output 6
7.2 x 1,000,000 = 7,200,000 - Needs to output 5
.72 x 1,000,000 = 720,000 - Needs to output 4

更新: 我现在在使用时会得到正确的输出

Update: I am now getting proper outputs when I use

decimal n = str.Split('.')[0].Substring(2, str.Length - 2).Count( s => s == '0');

但是现在我得到一个错误:索引和长度必须引用字符串中的位置. 参数名称:长度"

but now I get an error: "Index and length must refer to a location within the string. Parameter name: length"

推荐答案

如果我正确理解这一点，则只希望它输出零数.为此，您将执行以下操作:

If I understand this correctly you just want it to output the number of zeros. To do this you would do the following:

var y = 1000000;
var answer = x * y;

string numString = answer.ToString();
char[] charArray = numString.ToCharArray();
int count = 0;
for(int i = 2; i < charArray.Length; i++)
{
     if(charArray[i] == '0')
     {
          count++;
     }
}
string output = count.ToString();

使用此方法，输出将是前两位数字之后的零字符串计数.

Using this, output will be the string count of zeros after the first 2 digits.

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