I want explanation of this program, /** * 3.4PP how to create methods to calculate and return values (functions) *Calculate how much interest you...

I want explanation of this program,

/**

 * 3.4PP how to create methods to calculate and return values (functions)

 *Calculate how much interest you will get on an investment.

 * @author Supriya Kale

 */

 public class InvestmentCalc {

 public static double compoundInterest(int principal, int periods, double rate) {

 return principal * Math.pow(1 + rate, periods)- principal;

 }

 public static void main (String[] args){

   Scanner sc = new Scanner (System.in);

   int principal = 0;

   int periods = 0;

   double rate = 0;

   System.out.println("Investment Calculator");

   System.out.println("Bank A: $" + compoundInterest(1000,3,0.035));

   System.out.println("Bank B: $" + compoundInterest(1000,3,0.045));

   System.out.println("Input principle ($):");

   principal = sc.nextInt();

   System.out.println("Input interest rate (percent):");

   rate = sc.nextDouble();

   System.out.println("CALCULATING...");

   rate = rate / 100;

   System.out.println("5 year investment $: " +

   compoundInterest(principal,5,rate));

 }

 }