“？：”中的十进制除法错误操作者 [英] Error in decimal divide in "?:" operator
问题描述
我有一个用C＃Visual Studio 2005编写的Web服务，用于计算事务中两个或多个计时器之间的拆分
。为了设置它，我有一个特定计时器的几个十进制数据类型变量：
timerRow [" diff_time"] = 4.5M
tkRate = 130M
tkAmount = 585M（timerRow [" diff_time"] * tkRate）
totalAmount = 1605M（交易中所有tkAmounts的总和）
我执行以下代码行：
percentOfTransaction =（totalAmount == 0.00M？0.00M：tkAmount /
totalAmount）;
然后得到0.4382022471910112359550561798然而实际答案应该是
0.36448598130841121495327102803738。
如果我用以下代码替换代码：
percentOfTotal = 0.00M;
if（totalAmount！= 0.00M）
{
percentOfTotal = tkAmount / totalAmount;
}
我得到了正确答案。每次交易都不会发生错误，因为很多计算都是正确的。这是
批次中的第六个交易，也是唯一一个错误的交易。
另一个奇怪的事情是，使用命令窗口，如果我输入
？ tkAmount / totalAmount
它会回答正确的答案和
？ percentOfTransaction
产生错误的结果，表明变量设置正确。
之前有人见过这种行为，因为我使用这个构造很棒交易
检查除以零？
-
问候，
JayAchTee
我要做的第一件事就是放入一些括号，看看是否有运营商
分组是我认为的。
" JayAchTee" < Ja ******* @ discussion.microsoft.com写信息
新闻：BD ********************* ************* @ microsof t.com ...
>我有一个用C＃Visual Studio 2005编写的Web服务计算
在交易中两个或多个计时员之间拆分
。为了设置它，我有一个特定计时器的几个十进制数据类型变量：
timerRow [" diff_time"] = 4.5M
tkRate = 130M
tkAmount = 585M（timerRow [" diff_time"] * tkRate）
totalAmount = 1605M（交易中所有tkAmounts的总和）
我执行以下代码行：
percentOfTransaction =（totalAmount == 0.00M？0.00M：tkAmount /
totalAmount）;
然后得到0.4382022471910112359550561798然而实际答案应该是
0.36448598130841121495327102803738。
如果我用以下代码替换代码：
percentOfTotal = 0.00M;
if（totalAmount！= 0.00M）
{
percentOfTotal = tkAmount / totalAmount;
}
我得到了正确答案。每次交易都不会发生错误
as
许多计算都是正确的。这是第8次交易
，每次8美元，而且唯一一次是错误的。
另一个奇怪的事情就是这样，使用命令窗口，如果我键入
？ tkAmount / totalAmount
它会回答正确的答案和
？ percentOfTransaction
产生错误的结果，表明变量已正确设置
。
有没有人见过这种行为之前因为我使用这个构造了很多
检查除以零？
-
问候，
JayAchTee
JayAchTee写道：
< blockquote class =post_quotes>
我有一个用C＃Visual Studio 2005编写的Web服务，用于计算事务中两个或多个计时器之间的拆分
。为了设置这个，我有一个来自一个特定计时器的几个十进制数据类型变量：
使用你的代码（大致），我得到：
~
cat prog.cs
使用系统;
class App
{
static void Main（）
{
decimal diff_time = 4.5M;
十进制速率= 130M;
十进制数量= diff_time * rate;
十进制totalAmount = 1605M;
十进制百分比= （totalAmount == 0M？0M：金额/
totalAmount）;
Console.WriteLine（百分比）;
}
}
~
I have a web service written in C# Visual Studio 2005 that calculates splits
between two or more timekeepers in a transaction. To set this up I have
several decimal data type variables from one particular timekeeper:
timerRow["diff_time"] = 4.5M
tkRate = 130M
tkAmount = 585M (timerRow["diff_time"] * tkRate)
totalAmount = 1605M (sum of all tkAmounts in the transaction)
I execute the following line of code:
percentOfTransaction = (totalAmount == 0.00M ? 0.00M : tkAmount /
totalAmount);
and get 0.4382022471910112359550561798 however the actual answer should be
0.36448598130841121495327102803738.
If I replace the code with:
percentOfTotal = 0.00M;
if (totalAmount != 0.00M)
{
percentOfTotal = tkAmount / totalAmount;
}
I get the correct answer. The error does not occur for every transaction as
many of the calcuations come out correct. This is the sixth transaction in a
batch of eight and the only one that is wrong.
The other curious thing is that, using the command window, if I type
? tkAmount / totalAmount
it responds with the correct answer and
? percentOfTransaction
yields the erroneous result indicating that the variables are set properly.
Has anyone seen this behavior before as I use this construct a great deal in
checking for divide by zero?
--
Regards,
JayAchTee
The first thing I''d do is put in some parentheses and see if the operator
grouping is what I think it is.
"JayAchTee" <Ja*******@discussions.microsoft.comwrote in message
news:BD**********************************@microsof t.com...>I have a web service written in C# Visual Studio 2005 that calculates
splits
between two or more timekeepers in a transaction. To set this up I have
several decimal data type variables from one particular timekeeper:
timerRow["diff_time"] = 4.5M
tkRate = 130M
tkAmount = 585M (timerRow["diff_time"] * tkRate)
totalAmount = 1605M (sum of all tkAmounts in the transaction)
I execute the following line of code:
percentOfTransaction = (totalAmount == 0.00M ? 0.00M : tkAmount /
totalAmount);
and get 0.4382022471910112359550561798 however the actual answer should be
0.36448598130841121495327102803738.
If I replace the code with:
percentOfTotal = 0.00M;
if (totalAmount != 0.00M)
{
percentOfTotal = tkAmount / totalAmount;
}
I get the correct answer. The error does not occur for every transaction
as
many of the calcuations come out correct. This is the sixth transaction
in a
batch of eight and the only one that is wrong.
The other curious thing is that, using the command window, if I type
? tkAmount / totalAmount
it responds with the correct answer and
? percentOfTransaction
yields the erroneous result indicating that the variables are set
properly.
Has anyone seen this behavior before as I use this construct a great deal
in
checking for divide by zero?
--
Regards,
JayAchTee
JayAchTee wrote:
I have a web service written in C# Visual Studio 2005 that calculates splits
between two or more timekeepers in a transaction. To set this up I have
several decimal data type variables from one particular timekeeper:Using your code (roughly), I get:
~
cat prog.cs
using System;
class App
{
static void Main()
{
decimal diff_time = 4.5M;
decimal rate = 130M;
decimal amount = diff_time * rate;
decimal totalAmount = 1605M;
decimal percent = (totalAmount == 0M ? 0M : amount /
totalAmount);
Console.WriteLine(percent);
}
}
~
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