我们如何接受十进制数字，如果它超过0.5，将如何舍入该值 [英] How will we accept the decimal numbers and how will round off the value if it is more than .5

问题描述

我们如何接受十进制数字以及如果它超过.5

解决方案

我将假设您的意思是用户输入小数文本框中的值，并将其转换为数值：

  decimal  val; 
  if （！decimal.TryParse（myTextBox.Text， out  val））
 {
  //  向用户报告错误 
 返回; 
} 

舍入也很简单：您可以使用许多重载来获得您想要的结果：Math.Round [ ^ ]

您好，

试一试代码：

 <   script     language   =  javascript >  
  function  mathRoundForDecimals（source）{
  var  txtBox =  document  .getElementById（source）; 
  var  txt = txtBox.value; 
  if （！isNaN（txt）&&  isFinite （txt）&& ; txt.length！=  0 ）{
  var  rounded = 数学 .round（TXT）; 
 alert（四舍五入）; 
 txtBox.value = rounded.toFixed（ 2 ）; 
} 
} 
 
 <   /  < span class =code-leadattribute> script  >  
 
 
 <   asp：textbox     id   =  txtDecimal    runat   =  server    onkeypress   =  return isNumberKey（this，event）;    onchange   =  mathRoundForDecimals（this.id）;    xmlns：asp   = ＃unknown >  <   / asp：textbox  >  
 
 <   asp：regularexpressionvalidator     xmlns：asp  < span class =code-keyword> = ＃unknown >  
 id =RegularExpressionValidator1
 runat =server
 ControlToValidate =txtDecimal
 ErrorMessage =Numeric and Desimal
 ValidationExpression =（^ [0-9] * [1-9] + [0-9] * \ [0-9] * 

）|。。（^ [0-9] * \ [0-9 ] * [1-9] + [0-9] *

How will we accept the decimal numbers and how will round off the value if it is more than .5

解决方案

I assume you mean the user enters a decimal value in a textbox and you convert it to a numeric value:

decimal val;
if (!decimal.TryParse(myTextBox.Text, out val))
   {
   // Report error to user
   return;
   }

Rounding is also simple: there are a number of overloads you can use to get exactly the result you want: Math.Round[^]

Hi,
Try this code :

 <script language="javascript">
 function mathRoundForDecimals(source) {
         var txtBox = document.getElementById(source);
         var txt = txtBox.value;
         if (!isNaN(txt) && isFinite(txt) && txt.length != 0) {
             var rounded = Math.round(txt);
             alert(rounded);
             txtBox.value = rounded.toFixed(2);
         }
     }

    </script>


   <asp:textbox id="txtDecimal" runat="server" onkeypress="return isNumberKey(this, event);" onchange="mathRoundForDecimals(this.id);" xmlns:asp="#unknown"></asp:textbox>

<asp:regularexpressionvalidator xmlns:asp="#unknown">
  id="RegularExpressionValidator1" 
  runat="server" 
  ControlToValidate="txtDecimal" 
  ErrorMessage="Numeric and Desimal" 
  ValidationExpression="(^[0-9]*[1-9]+[0-9]*\.[0-9]*

)|(^[0-9]*\.[0-9]*[1-9]+[0-9]*

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