当我的Windows窗体上的数字相加时，0会被截止。 [英] When numbers are summed on my Windows Form, the 0's are cut off the answer.

问题描述

我创建了一个Windows Form长话短说。如果我在框中键入3.00，最后它将显示为3而不是3.00。为什么要摆脱所有的零？



我期待这是一个简单的解决方案，这里是代码，不要害怕。我确信解决方案很简单。

I have created a Windows Form long story short. If i type in 3.00 into the box, at the end it will show as 3 not 3.00. Why is it getting rid of all the zero's?

I'm expecting this to be a simple solution, here is the code, don't be scared. I'm sure the solution is simple.

public partial class Form1 : Form
    {
        double[] _prices = new double[10];
        int _index;
        string _outputDouble = "";
        double _total = 0.00;
        double _vat = 0.00;

        private void Display()
        {
            _outputDouble = "";


            foreach (double price in _prices)
            {
                _outputDouble = _outputDouble + price + "\r\n";
            }

            displayTextBox.Text = _outputDouble;
        }

        private void Total()
        {
            foreach (double price in _prices)
            {
                _total = _total + price;
            }

            totalDisplay.Text = _total.ToString();
        }

        private void VAT()
        {
            _vat = _total * 17.5 / 100 ;

            vatDisplay.Text = _vat.ToString();
        }

        private void TotalVAT()
        {
            double totalVAT = 0.00;

            totalVAT = _total + _vat;

            totalVATDisplay.Text = totalVAT.ToString();
        }

        private void MinMax()
        {
            double max = 0.00;
            double min = 0.00;

            for (_index = 0; _index < 10; _index++)
            {
                if (_prices[_index] > max)
                {
                    max = _prices[_index];
                }

                if (0 == _index)
                    min = _prices[_index];

                else if (_prices[_index] < min)
                    min = _prices[_index];
            }

            maxPriceDisplay.Text = max.ToString();

            minPriceDisplay.Text = min.ToString();
        }


        public Form1()
        {
            InitializeComponent();
        }

        private void enterPriceButton_Click(object sender, EventArgs e)
        {
            if (_index < 10)
            {
                _prices[_index] = double.Parse(priceTextBox.Text);
                priceTextBox.Text = "";
                _index++;
            }
            else
            {
                enterPriceButton.Enabled = false;
                Display();
            }
        }

        private void calcTotalButton_Click(object sender, EventArgs e)
        {
            Total();
            VAT();
            TotalVAT();
            MinMax();
            calcTotalButton.Enabled = false;
        }

    }

推荐答案

浮点数3与3.00相同;没有任何东西被削减。



当你应该显示一些数字时，你实际上使用通过 double.ToString 。要控制此表示，您只需要学习字符串格式。请参阅：

http://msdn.microsoft.com /en-us/library/system.double.tostring.aspx [ ^ ]，

http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx [ ^ ]，

http://msdn.microsoft.com/en-us/library/0c899ak8.aspx [ ^ ]。

-SA

The floating number 3 is the same as 3.00; nothing is cut.

When you should show some number, you actually use string representation of it obtained via double.ToString. To control this representation, all you need is to learn string formatting. Please see:
http://msdn.microsoft.com/en-us/library/system.double.tostring.aspx[^],
http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx[^],
http://msdn.microsoft.com/en-us/library/0c899ak8.aspx[^].

—SA

您可以使用 ToString（。0 ##），并使用＃想要的小数#.eg

You can use ToString(".0##") with as much # as decimals you want.e.g.

string strvalue = value.ToString(".0##");

对于浮动，您可以在.0之后使用6＃，对于双倍，您可以使用15＃。



通过这个你可以更好地理解转换和我还建议你在上面的答案中浏览sergey提供的链接。它以简洁的方式解释所有内容。



问候......：笑：

For float,you can use 6 #s after the .0 and for double you can use 15 #s.

By this you can have better understanding of conversion and i also recommend you to go through the links provided by sergey in above answer.It explains everything in a concise way.

Regards.. :laugh:

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