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Join Date: Dec 2006
Posts: 54
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Junior Poster in Training
variable Initialisation in JSP I am new to JSP and was trying a very simple program that adds/Divide/multiply/Subtract 2 numbers
I am taking two numbers from a web page and as per the button pressed performing the action on JSP page. I have kept a vraiable c for output
If i write int c=0 ;then it works fine but if i only write int c and then code its not working
I have never observed this behavior in core Java.Is variable initialisation is mandatory in JSP.FOllowing is code i am using that throws exception
I am taking two numbers from a web page and as per the button pressed performing the action on JSP page. I have kept a vraiable c for output
If i write int c=0 ;then it works fine but if i only write int c and then code its not working
I have never observed this behavior in core Java.Is variable initialisation is mandatory in JSP.FOllowing is code i am using that throws exception
<body><%
int a=Integer.parseInt(request.getParameter("t1"));
int b=Integer.parseInt(request.getParameter("t2"));
int c ;
String label=request.getParameter("b1");
if (label.equals("add"))
c=a+b;
else
if (label.equals("sub"))
c=a-b;
else
if (label.equals("mul"))
c=a*b;
else
if (label.equals("div"))
c=a/b;
%>
<% out.print(c);%>
</body>
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Join Date: Feb 2006
Posts: 1,594
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What happens, if it makes it all the way to the last nested if statement and that statement evaluates to false instead of true? What value would c have then? None because it hasn't been initialised. Add an else to the last nested if and the error will go away.
Java Programmer and Sun Systems Administrator
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
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Join Date: Nov 2004
Location: Netherlands
Posts: 5,749
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and why do this at all?
When will kids learn that scriptlets are there for backwards compatibility only and should never have been invented?
When will kids learn that scriptlets are there for backwards compatibility only and should never have been invented?
As people are clearly allowed to attack me but I'm not allowed to defend myself, I no longer post to this site.
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