如何计算总金额。 [英] How to calculate total amt.

问题描述

我想计算总数。为此，我使用下面的代码afxt_TextChanged事件。

I want to calculate total. For this I am using following code undertxtDisc_TextChanged event.

qty = Convert.ToInt32(txtQty.Text)
        rate = Convert.ToInt32(txtRate.Text)
        disc = Convert.ToInt32(txtDisc.Text)

        total = qty * rate
        amt = total / disc
        total1 = total - disc

        txtAmt.Text = Convert.ToInt32(total1)

当我放入光盘时，代码计算正确的总数> 0，即如果我使用disc = 0则系统抛出错误：算术运算导致溢出。



另一个问题是如果我第一次把disc = 12& ;在前进之前我将其更改为10然后系统抛出错误：输入字符串格式不正确。

Code calculate correct total when i put disc > 0, i.e If I use disc = 0 then system throws an error :Arithmetic operation resulted in an overflow.

Another problem is If first time I put disc = 12 & before move forward I changed it to 10 then system throws an error : Input string is not in correct format.

推荐答案

在执行计算之前，您必须确保所有输入值都正确。

我建议尝试TryParse尝试Catch块

You must ensure all input values were correct before performing calculation.
I suggest TryParse instead Try Catch block

If Integer.TryParse(txtQty.Text, qty) AndAlso Integer.TryParse(txtRate.Text, rate) AndAlso Integer.TryParse(txtDisc.Text, disc) AndAlso (disc > 0) Then
    ' Do calculation here
    total = qty * rate
    amt = total / disc ' I suggest: amt = total \ disc
    total1 = total - disc
    txtAmt.Text = Convert.ToInt32(total1).ToString()
Else
    ' Something wrong in input parameter
    ' Do not calculate, you can give a MessageBox to tell user
End If

因为你是除以零？



尝试：

Because you are dividing by zero?

Try:

If total <> 0 And disc <> 0 Then
        amt = total / disc
Else
        amt = 0
End If

我不明白你的意思第二个问题，''&在前进之前我将它改为10'' - 你能更详细地解释一下吗？

I don''t get what you mean by the second question, ''& before move forward I changed it to 10 '' - can you explain in more detail?

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