For square root of biginteger

Hi everyone,
would you please tell me the link to get the implementation for one BigInteger's squre root?
Regards,
Ping

Although there are no methods to get the square root in the API, you can go through the recursive solution using basic math operators:
An = (Al / X + Al)/2 where Al is the last number from the resursion (or initially a guess), X is the number you are trying to find the root of, and An is your next closest answer. By recursively feeding An into Al, each iteration will result in An being closer to the actual square root. Repeat until you are within the error of margin you want. However, for this process to work, you need to have floating point values, so you may have to convert the values to BigDecimal objects first. I haven't been able to test this, so I hope it works.
-JBoeing

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    //          while (!done)
              //program input
              System.out.println("\t\t\tSQUARE ROOT CALCULATOR PROGRAM");
              System.out.println(""); //skip line
              System.out.println("Enter the number you would like to be square rooted or [0] to end the program.");
              System.out.print("");
              SquareRoot = Keyboard.readInt();
              System.out.println(""); //skip line
              System.out.println("You entered "+SquareRoot+".");
              System.out.println(""); //skip line
              //for loop function
              for(int i = 0; i < 999999; i++)
              tempReg1 = i * i;
              tempReg2 = i;
    //          while (!done)
                        if(tempReg1 == SquareRoot)
                             System.out.println("The square root is "+tempReg2);
                             System.out.println("");
                        else
                             System.out.print("");
              //while loop check to finish
    //          if(SquareRoot == 0)
    //               done = true;
    //          }//end while loop
    }Here is my code for and of you who ever wants to use it. Our assignment was to make a square root calculator using ForLoop (a.k.a. no square root functions).
    My question is, how would I make it increase by .0001 instead of 1 every loop? I need it to do that so I can find square roots of numbers of numbers that have decimals for squares.

    * Programmer:      R McBride
    * Date:           November 29, 2006
    * Filename:     SquareRootForLoop.java
    * Purpose:          This program uses for()loops to
    *                    find the square root of a number
    *                    up to four decimal places long.
    import APCS.Keyboard;
    class SquareRootForLoopTest1
         public static void main (String[]args)
              //define variables
              double SquareRoot = 0; //holds initial value
              double num1 = 0;
              boolean done = false;
              double tempReg1 = 0; //holds initial value of i
              double tempReg2 = 0; //holds
              double tempReg3 = 0;
              //while loop start
    //          while (!done)
              //program input
              System.out.println("\t\t\tSQUARE ROOT CALCULATOR PROGRAM");
              System.out.println(""); //skip line
              System.out.println("Enter the number you would like to be square rooted or [0] to end the program.");
              System.out.print("");
              SquareRoot = Keyboard.readInt();
              System.out.println(""); //skip line
              System.out.println("You entered "+SquareRoot+".");
              System.out.println(""); //skip line
              //for loop function
              for(double i = 0; i < 999999; i+=.0001)
              tempReg1 = i * i;
              tempReg2 = i;
    //          while (!done)
                        if(tempReg1 == SquareRoot)
                             System.out.println("The square root is "+tempReg2);
                             System.out.println("");
                        else
                             System.out.print("");
              //while loop check to finish
    //          if(SquareRoot == 0)
    //               done = true;
    //          }//end while loop
    }Still doesn't work. =[                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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