Chapter4_Loops_Ex15

import java.util.Scanner;
/*
    ======================================
              chapter 4: Loops

            Ex15: Christmas tree
    ======================================
*/

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

        //variables
        int base;
        Scanner s=new Scanner(System.in);

        //user input- bulletproof against stupid users
        do{
            System.out.println("Enter odd number for base: ");
            base=s.nextInt();
        }while(base%2==0);

        //printing triangle base in bottom
        for(int row=0;row<base;row++) {
            for (int i = 0; i < base; i++) {
                for (int space = i + 1; space < base; space++)    //loop for space
                    System.out.print(" ");
                for (int j = base - i - 1; j < base; j++)
                    System.out.print("* ");     //loop for stars
                System.out.println();
            }
        }

        //loop for tree trunk
        for(int trunk=0;trunk<base;trunk++) {
            for(int space=0; space<base/2;space++)  //loop for space
                System.out.print("  ");
            System.out.println("*");
        }

    }
}