如何将字符型的加号“+”转换成运算符的加号"+"

[yliang82]

1.asp有2个文本框和一个下拉框
文本框1(基数) JiShu
文本框2(增减百分比) BaiFenBi
下拉框（运算符加或减）JiaJian
然后提交到2.asp,
我想得到计算公式 JieGuo=request("JiShu")&request("JiaJian")&request("JiShu")*request("BaiFenBi")的结果，
但是问题是 request("JiaJian")等到的值"+"或"-"是个字符形式不是预算符形式，请问怎么转换啊？

[littlelam]

try
Response.Write Execute("1+1")
Response.Write Eval("1+1")

[netWild]

'by netwild
Dim JieGuo,JiShu,JiaJian,BaiFenBi
JiShu = request("JiShu")
JiaJian = request("JiaJian")
BaiFenBi = request("BaiFenBi")
execute "JieGuo=" & JiShu & JiaJian & jiShu & BaiFenBi

response.write JieGuo

[yanniu008]

eval("表达式")

[gingerkang]

select case request("JiaJian")
case "+"
..
case "-"
...
end select

或者
JieGuo=eval(request("JiShu")&request("JiaJian")&request("JiShu")&"*"&request("BaiFenBi"))

[mezzi100]

<form id="form1" name="form1" method="post" action="">
基数：<input name="a" type="text" id="a" value="<%=request("a")%>" />
百分比：<input name="b" type="text" id="b" value="<%=request("a")%>" size="3" maxlength="3" />
% 
操作：<select name="c" id="c">
      <option value="+" <%if(request("c")="+")then%>selected<%end if%>>+</option>
      <option value="-" <%if(request("c")="-")then%>selected<%end if%>>-</option>
    </select> 
      <input type="submit" name="Submit" value="提交" />
  </form>
计算结果：
<%
dim a,b,c,d
a = request("a")
b = request("b")
c = request("c")
d=""
if c="+" then
	response.write int(a)+int(a)*(b/100)
else
	response.write int(a)-int(a)*(b/100)
end if

%>