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do while help

3 replies on 1 page. Most recent reply: Jul 7, 2004 3:49 PM by Kishori Sharan

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hyderman

Posts: 11
Nickname: salem99
Registered: Oct, 2002

do while help

Posted: Jul 7, 2004 9:07 AM

hi
i hav a problem with do while in this code

public int find (int value)
{

int counter = 0;
Node tempNode = root;

do {

counter++;
if (value == tempNode.getValue() )
{
this.current = tempNode;
return counter;
}
else if (value < tempNode.getValue() )
{
tempNode = tempNode.getLeft();
//this.current = tempNode;
}
else
{
tempNode = tempNode.getRight();
//this.current = tempNode;
}
}
//current = null;
return -1 * counter;
} while (tempNode != null);

its not running and i am confused where is the problem here.

thanx

mausam

Posts: 243
Nickname: mausam
Registered: Sep, 2003

Re: do while help

Posted: Jul 7, 2004 9:32 AM

How did ur code compiled first.

You have put while at the end of function

Put while at the end of do loop

}
//current = null;
return -1 * counter;
} while (tempNode != null);

should read

}while (tempNode != null);
 
//current = null;
return -1 * counter;
}

hyderman

Posts: 11
Nickname: salem99
Registered: Oct, 2002

Re: do while help

Posted: Jul 7, 2004 10:23 AM

thanx for replying, actually still giving me running errors

public int find (int value)
{
int counter = 0;
Node tempNode = root;
do{
counter++;
if (value == tempNode.getValue() )
{
this.current = tempNode;
return counter;
}
else if (value < tempNode.getValue() )
{
tempNode = tempNode.getLeft();
//this.current = tempNode;
}
else
{
tempNode = tempNode.getRight();
//this.current = tempNode;
}
}
//current = null;
while (tempNode != null);

return -1 * counter;
}

i am not sure where is the error here, i must use either do while or for loop, i tried several ways and still running error, it compiles but it gives running errors

message:
"exception in thread "main" java.lang.NullPointerException"

Kishori Sharan

Posts: 211
Nickname: kishori
Registered: Feb, 2002

Re: do while help

Posted: Jul 7, 2004 3:49 PM

Unless you post all your code it is hard to tell why are you getting Nullpointer exception. It seems your root variable is null to begin with. That is what, you are getting that error. Just to debug it, print before you start do-while loop to see if root is null or not. Just before do, write as:

Node tempNode = root;
 if ( root == null ) {
   System.out.println ( "root is null");
   return -1;
 }

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