[英]C# Math Problem
I have been working on this for the greater part of the day and I cant seem to make this part of my code work. 在一天的大部分时间里,我一直在从事此工作,而我似乎无法使我的代码工作于此。 The intent of the code is to allow the user to input a set of values in order to calculate the missing value.
该代码的目的是允许用户输入一组值以计算缺失值。 As an additional feature I placed a CheckBox on the form to allow the user to do further calculation.
作为一项附加功能,我在窗体上放置了一个CheckBox,以允许用户进行进一步的计算。 That is where my problem lies.
那就是我的问题所在。 I know the code works because if I change the formula the value that appears in tb3_aic.Text changes per the formula.
我知道代码有效,因为如果更改公式,则出现在tb3_aic.Text中的值会根据公式更改。 However, when I use the below the answer does not change like it should.
但是,当我使用以下内容时,答案不会像应有的那样改变。 Please reference the attached code.
请参考随附的代码。 If a jpg image is needed of the formula I can e-mail it.
如果需要该公式的jpg图片,我可以通过电子邮件发送。
void Calc3Click(object sender, EventArgs e)
{
if (String.IsNullOrEmpty(tb3_skv.Text) | String.IsNullOrEmpty(tb3_kva.Text) | String.IsNullOrEmpty(tb3_z.Text))
{
MessageBox.Show("Enter all required values", "Missing Data", MessageBoxButtons.OK);
} //If user does not enter all the values required for the calculation show error message box
else
{
if (!String.IsNullOrEmpty(tb3_skv.Text) & !String.IsNullOrEmpty(tb3_kva.Text) & !String.IsNullOrEmpty(tb3_z.Text))
{ //If motor load check box is not checked and required values are entered calculate AIC based on formula.
int y;
decimal x, z, a;
x = decimal.Parse(tb3_skv.Text);
y = int.Parse(tb3_kva.Text);
a = decimal.Parse(tb3_z.Text);
z = (y * 1000) / (x * 1.732050808m) / (a / 100); //the m at the end of the decimal allows for the multiplication of decimals
tb3_aic.Text = z.ToString();
tb3_aic.Text = Math.Round(z,0).ToString();
}
if (cb3_ml.Checked==true)
{//If Motor Load CB is checked calculate the following
int y, b;
decimal x, z, a;
x = decimal.Parse(tb3_skv.Text);
y = int.Parse(tb3_kva.Text);
a = decimal.Parse(tb3_z.Text);
b = int.Parse(tb3_ml.Text);
z = ((y * 1000) / (x * 1.732050808m) / (a / 100))+((b / 100)*(6*y)/(x*1.732050808m)*1000);
tb3_aic.Text = z.ToString();
tb3_aic.Text = Math.Round(z,5).ToString();
}
}
I am grateful for any help that can be provided. 感谢您能提供的任何帮助。
Thank you, Greg Rutledge 谢谢Greg Rutledge
Without really knowing what the problem is, a few things look a bit odd: 在不真正知道问题出在哪里的情况下,有些事情看起来有些奇怪:
Edit: This is apparently wrong in C#: 编辑:这在C#中显然是错误的:
The only difference between them when used with boolean operands are that && short circuits (doesn't evaluate the right operand if the left is false). 与布尔操作数一起使用时,它们之间的唯一区别是&&短路(如果left为false,则不评估右侧的操作数)。 I learned something, thank you people commenting.
我学到了一些东西,谢谢大家的评论。 :)
:)
Change this: 更改此:
int y, b;
To this: 对此:
int y;
decimal b;
and it works, according to this test: 根据此测试,它可以正常工作:
public void Test2()
{
int y;
decimal b;
decimal x, z, a;
decimal z1, z2;
x = 480m;
y = 2500;
a = 5.75m;
b = 10;
z1 = ((y * 1000) / (x * 1.732050808m) / (a / 100));
z2 = ((b / 100) * (6 * y) / (x * 1.732050808m) * 1000);
z = z1 + z2;
Console.WriteLine("{0}, {1}", z1, z2);
Console.WriteLine(Math.Round(z, 0).ToString());
}
The reason is that integer 10 divided by integer 100 is integer 0, which zero's the whole z2. 原因是整数10除以整数100就是整数0,这是整个z2的零。
I don't know if this is huge but you are setting the text of the tb3_aic textbox twice when maybe you are trying to concatenate? 我不知道它是否很大,但是当您尝试连接时,您要两次设置tb3_aic文本框的文本?
tb3_aic.Text = z.ToString();
tb3_aic.Text = Math.Round(z,0).ToString();
You seem to be doing this in both methods. 您似乎在两种方法中都这样做。
The more that I look at it, this could be an issue since you are setting it in the first if then the second If will overwrite that if the checkbox is checked. 我查看的次数越多,这可能是一个问题,因为如果您在第一个If中设置了该属性,则在第二个If中设置了该复选框(如果选中该复选框)。
Sample Inputs, first formula x = 480 y = 2500 a = 5.75 样本输入,第一个公式x = 480 y = 2500 a = 5.75
For the first formula the output should be 52296 对于第一个公式,输出应为52296
Sample Inputs, second formula x = 480 y = 2500 a = 5.75 b = 10 样本输入,第二个公式x = 480 y = 2500 a = 5.75 b = 10
For the first formula the output should be 54100.42 对于第一个公式,输出应为54100.42
Hope this helps 希望这可以帮助
不需要此行,尽管它不是错误,但总会评估为true
if (!String.IsNullOrEmpty(tb3_skv.Text) & !String.IsNullOrEmpty(tb3_kva.Text) & !String.IsNullOrEmpty(tb3_z.Text)) {
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