如何消除我的计算结果 [英] How to get the negative out of my calculation

问题描述

我有三个文本框可以对文本框文本更改进行计算。计算完成后，答案中有否定。这是我的代码：

I have three textboxes that do calculations on a textbox text change. When the calculations is done there is a negative in the answer. Here is my code:

int k = Convert.ToInt32(TextBox1.Text);
int l = Convert.ToInt32(TextBox2.Text.Replace(",", ""));
TextBox3.Text = Convert.ToString((k - l) * 100.0 / ((k + l) / 2));
TextBox3.Text = Math.Round(Convert.ToDouble(TextBox3.Text), 2).ToString();

这是我想做的事。

Here is what I am trying to do.

Calculate percentage difference
between V1 = 100 and V2 = 1000

( | V1 - V2 | / ((V1 + V2)/2) ) * 100

= ( | 100 - 1000 | / ((100 + 1000)/2) ) * 100
= ( | -900 | / (1100/2) ) * 100
= ( 900 / 550 ) * 100
= 1.636364 * 100

= 163.6364% difference 

It is from this website:

<a href="http://www.calculatorsoup.com/calculators/algebra/percent-difference-calculator.php">http://www.calculatorsoup.com/calculators/algebra/percent-difference-calculator.php</a>[<a href="http://www.calculatorsoup.com/calculators/algebra/percent-difference-calculator.php" target="_blank" title="New Window">^</a>]

How will I get the negative out?

推荐答案

当你看到公式：

百分比差异=（| ΔV| /（ΣV/ 2））* 100 =（|（V1 - V2）| /（（V1 + V2）/ 2））* 100



您知道必须使用绝对值（ http://en.wikipedia.org/wiki/Absolute_value [ ^ ]）差异V1-V2因此：

When you see the formula:
Percent difference = ( | ΔV |/ ( ∑V/2) ) * 100 = ( | (V1 - V2) | / ((V1 + V2)/2) ) * 100

You know you must use the absolute value (http://en.wikipedia.org/wiki/Absolute_value[^]) of the difference V1-V2 thus:

TextBox3.Text = Convert.ToString((Math.Abs(k - l)) * 100.0 / ((k + l) / 2));

这将使差价始终为非负值。



要回合：

This will make the difference always non-negative.

To round:

TextBox3.Text = Convert.ToString(Math.Round((Math.Abs(k - l)) * 100.0 / ((k + l) / 2)));

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