CompInterestCalc.java

import java.util.Scanner;

public class CompInterestCalc {
    public static void main(String[] args){

        // My attempted Compound Interest Calculator project.
        /*
        A = P [ 1 + r/n ]^nt
        A is amount, P is principal amount
        r is Interest Rate in decimal or percentage
        n is the Number of times interest is compounded per year
        t is Time in years
         */

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the principal amount: $");
        double principal = scanner.nextDouble();

        System.out.print("Interest Rate (in %): ");
        double interestRate = scanner.nextDouble();
        interestRate /= 100;
        // interest rate will be divided by 100, to give in % form.

        System.out.print("How many times compounded per year: ");
        int timesCompounded = scanner.nextInt();

        System.out.print("Number of years: ");
        int years = scanner.nextInt();

        /*
        double Amount = 1 + interestRate / timesCompounded;
        //nt is timesCompounded(n) x Years(t)
        double nt = timesCompounded * years;
        double Amount2 = Math.pow(Amount, nt);
        double finalAmount = Amount2 * principal;
         */

        // Shorter version, the using nested brackets.
        double finalAmount = principal * Math.pow((1 + interestRate / timesCompounded), timesCompounded * years);

        System.out.printf("\nThe final amount after %d years is $%.2f", years, finalAmount);

        scanner.close();
    }
}