Loops - execise no 04 slide no 66

package class170629;

import java.util.Scanner;

public class LoopsEx04Slide66 {

    public static void main(String[] args) {
        // input: integer number.
        // output: triangle aligned to right

        // create a scanner
        Scanner s = new Scanner(System.in);

        // ask for input
        System.out.print("Enter an integer number: ");
        // get and save input value
        int n = s.nextInt();

        // close scanner
        s.close();

        /*
         * first solution: printing single char every time
         */
        // for each row
        for (int row = 0; row < n; row += 1) {
            // print spaces first
            for (int spc = 0; spc < row; spc += 1) {
                System.out.print(" ");
            }

            // print asterisks
            for (int ast = 0; ast < n - row; ast += 1) {
                System.out.print("*");
            }

            // end of the line
            System.out.println();
        }

        /*
         * second solution: using String format and printf
         */
        // for each row
        for (int row = 0; row < n; row += 1) {
            // build string of spaces
            String spc = row == 0 ? "" : String.format("%" + row + "s", " ");
            // build string of asterisks
            String ast = n == row ? "" : String.format("%" + (n - row) + "s",
                    " ").replace(" ", "*");

            // print the row
            System.out.printf("%s%s\n", spc, ast);
        }
    }
}