import java.text.DecimalFormat; // for formatting doubles
import uwcse.io.*;

/**
 *  Practicing using loops
 */

public class Loops {

    /**
     * Check that the sum of the cubes is the square of the sum <p>
     *
     * i.e. (^ means exponentiation (not available in java)) <br>
     * 1^3 + 2^3 + 3^3 + ... + n^3 = (1 + 2 + 3 + ... + n)^2 <br>
     * Use a loop to allow the user to test the formula with
     * several values of n. Exit the loop if n is not a
     * positive integer.
     */
    public void sum3vsSum2()
    {
        int n;
        Input input = new Input();
        System.out.println("Sum of the cubes / square of the sum");

        do{ // Input n until n<=0
            n = input.readInt("Enter an integer (<=0 to quit): ");

            int sum = 0; // sum
            int sumCubes = 0; // sum of the cubes

            // Compute sum and sumCubes
            // use a for loop

            if (n>0)
                System.out.println("Sum of the cubes: "+sumCubes+
                "\nSquare of the sum: "+sum*sum);
        }while(n>0);
    }


    /**
     * Display shapes of stars<p>
     * In a console window, display the following shapes using for loops
     * <pre>
     * *         *
     * **       **
     * ***     ***
     * ****   ****
     * </pre>
     * Allow the user to select the number of lines. Repeat the process
     * until the user inputs a non positive value for the number of lines.
     */
    public void figuresOfStars()
    {
        int n;
        Input input = new Input();
        System.out.println("Display of stars");

    }

    /**
     * Sum the digits of a positive integer<p>
     * Let the user enter an integer.<br>
     * If the integer is positive, sum all of the digits of the integer. Repeat the process until you get a
     * single digit answer:<br>
     * for instance, 123456 gives 21 which gives 3<br>
     * Repeat the process until the user inputs a non positive value for the integer.
     */
    public void sumDigits()
    {
        int n;
        Input input = new Input();
        System.out.println("Sum the digits");

    }

    /**
     * Rolling a die<p>
     * Let the user enter an integer n.
     * Roll a dice n times and display how many times each face comes out.<br>
     * Repeat the process until the user enters a non positive value for n.
     */
    public void rollADie()
    {
        int n;
        Input input = new Input();
        System.out.println("Roll a die");

    }
}