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Help using Square Root Algorithm

 
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Help using Square Root Algorithm
shay_hookshot_07
5 Oct, 2007 - 11:19 AM
Post #1

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My assignment is to "guess" the square root using Newton's method.
I cannot figure out why it will not work?
I think it is something in the Why expression...
Java does not print out an "error"..it simply give an incorrect answer.
For example...it says the square root of 9 is 3.250000


import java.util.Scanner;
public class CalcSqrt
{
public static void main (String [] args)
{
Scanner sc= new Scanner (System.in);
System.out.print ("Enter positive number: ");

double N= sc.nextInt ();
double oldGuess=N/2.0;
double newGuess= ( (N / oldGuess) + oldGuess) / 2.0;

while ( (Math.abs(oldGuess - newGuess) <= .000001) && (newGuess > oldGuess) );
{
oldGuess=newGuess;
newGuess= ( (N / oldGuess) + oldGuess) / 2.0;
++oldGuess;
}


System.out.printf ("You entered " +N+ ", the square root is %.6f", newGuess);
}
}

This post has been edited by shay_hookshot_07: 5 Oct, 2007 - 12:33 PM
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rickyadd
RE: Help Using Square Root Algorithm
5 Oct, 2007 - 12:01 PM
Post #2

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put the error message on here

This post has been edited by rickyadd: 5 Oct, 2007 - 12:03 PM
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shay_hookshot_07
RE: Help Using Square Root Algorithm
5 Oct, 2007 - 12:34 PM
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QUOTE(rickyadd @ 5 Oct, 2007 - 01:01 PM) *

put the error message on here


Sorry..sad.gif

it does not give an error
it simply computes the incorrect answer

for example : it says the square root of 9 is 3.250000

(the loop is ending when it shouldn't)
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