Java SquareRoot, Factorial, Pi and Decimal Conversion program - 63376

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Java Programming

1.       Create a class called Project8 and implement the following methods:



a.       (factorial) write a method that calculates and return n!

b.       (computing Π(pi))  You can approximate Π by using the following series:


Π = 4(1 – 1/3 + 1/5 – 1/7 + 1/9 – 1/11 + …. + 1/2n-1 – 1/2n+1)


Write a method called pi, that given n, calculates and return value of Π


c.       (Approximating the square root) Implement the sqrt method. The square root of a number, num, can be approximated be repeatedly performing a calculation using the following formula:


nextGuess = (lastGuess + (num / lastGuess)) / 2


When next Guess and lastGuess are almost identical, nextGuess is the approximated square root.

        The initial guess can be any positive value (e.g., 1). This value will be the starting value for lastGuess. If the difference between nextGuess and lastGuess is less than a very small number, such as 0.0001, you can claim that nextGuess is the approximated square root of num. If not, nectGuess becomes lastGuess and the approximation process continues.

d.      (Convert form decimal to other bases) Write a method that converts decimal numbers to other bases (binary, octal, hexadecimal).


2.       Write a main method to the following:


a.       Calculates and prints value of Π for n=10000

b.      Calculate and print square root of 16

c.       Convert 125 to binary, octal, and hexadecimal




A sample run is as follows:

8! is: 40320

Value of pi is 3.1415826535898224

Square root of 16 is 4.000000000000051

125 in Binary is 1111101

125 in Octal is 175

125 in Hexadecimal is 7D

Solution Description


public class Program8 {

    private static double factorial(int n)


        int factorial = 1; // this  will be the result

        for (int i = 1; i <= n; i++) {

            factorial *= i;


        return factorial;