计算百分比公式不起作用 [英] Calculate percentage formula is not working

问题描述

我有一个表格会显示两个号码的百分比。当用户输入一个数字40，然后下一个数字是30时，计算完成，答案应为33％。当用户输入数字时，答案为-60。为什么会这样？我在公式中忘记了什么？

I have a form that will show what the percentage of two number. When a user enters a number say 40 and then the next number is 30, the calculation is done and the answer should be 33%. When the user enters the numbers, the answer comes to be -60. Why is this happening? What did I forget in my formula?

protected void TextBox3_TextChanged(object sender, EventArgs e)
       {
           int a = Convert.ToInt32(TextBox2.Text);
           int b = Convert.ToInt32(TextBox3.Text);
           TextBox4.Text = Convert.ToString(a - b / b * 100);
       }

The percentage increase from 30 to 40 is:
  (40-30)/30 * 100 = 33%

推荐答案

这是由于你没有添加括号

it is due to you have not add brackates

TextBox4.Text = Convert.ToString((a - b) / (b*1.0) * 100);

快乐编码！ ：）

Happy Coding! :)

比较你的例子和代码。但你应该在C＃中研究评估的优先顺序和顺序。
见



http://msdn.microsoft.com/en-us/library/2bxt6kc4.aspx [ ^ ]

Compare your'e example and code. But you should study the precedence and order of evaluation in C#
See

http://msdn.microsoft.com/en-us/library/2bxt6kc4.aspx[^]

除解决方案1-2：don使用转换，使用 Parse 或 TryParse ，以及 ToString （可能带有格式）。明确使用double type（或float）来计算百分比。

-SA

In addition to Solutions 1-2: don't use Convert, use Parse or TryParse, and ToString (possibly with format). Explicitly use double type (or float) to calculate percentage.

—SA

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