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Variables in JSP

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posted 20 years ago

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in C/C++ you can do following :
int a=0; // global variables
void func()
{
int b = 5;
a = b; // after this a's value is 5.
}
how do you write the same function in JSP so that a's value gets changed to 5.
here is the sample code :
<%! int a = 0 %>
<%! void func()
{
int b = 5;
a = b; // after this a's value is 5.
}
%>
<%-- following statement gives a's value 0 %>
<% func();
out.println(" a "+ a);
%>
How do u do it ?
Thanks in advance

Kishore Dandu

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Posts: 1934

posted 20 years ago

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Well to my knowledge, JSP follows the same programming rules as Java.
Since the variable a is defined outside the scope of function, it gets value of 5 only inside the function(since the variable is only passed by value and you are reinitializing it to 0 inside the function). If the reinitialization occurs outside a function it should get value of 5.
Rememer that all your code inside <%.... %> is processed on the server side.
Dan.

Kishore
SCJP, blog

Bear Bibeault

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posted 20 years ago

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Anand, firstly your example will not even compile. If you are going to ask people to spend time helping you, please take the time to make sure your questions are clear and any code samples are accurate.

Since the variable a is defined outside the scope of function, it gets value of 5 only inside the function

That make no sense. a is defined outside the method and there's no concept that a global variable will have a special "method internal" value. That might be true of passed parameters, but not of global variables.
When I added the missing semicolon to the end of the first declaration, I ran your example and got the expected output of "a 5".
Here's my complete test:

[ March 08, 2004: Message edited by: Bear Bibeault ]

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