Ответ:
import java.util.Scanner;
public class TreeStructures {
static Scanner scnr = new Scanner(System.in);
static int height;
public static void main(String[] args) {
System.out.print("How tall should the top of the tree be? ");
height = scnr.nextInt();
System.out.println();
if (height >= 5 && height
System.out.println("Flat tree:");
flatTree();
System.out.println("Xmas tree:");
xmasTree();
} else {
System.out.println("That's not a valid size. I can only do trees from 5 to 20");
System.out.println("Quitting now.");
}
}
public static void flatTree() {
int width = (height * 2) - 1;
// first for loop to print number of rows
for (int i = 1; i
// second for loop to print stars to create rectangle
for (int stars = 1; stars
System.out.print("*");
}
// println to print rows in.
System.out.println();
}
//first for loop to print out rows for the bottom part of tree
for (int i = 0; i
if (height % 2 == 0) {
for (int j = 0; j
System.out.print("*");
}
} else {
//second for loop to print out width for the bottom part of the tree
for (int j = 0; j
System.out.print("*");
}
}
System.out.println();
}
}
public static void xmasTree() {
int width = height * 2 - 1;
// NESTED LOOPS
// first for loop to print amount of rows
for (int i = 0; i < height; i++) {
// second for loop for print out spaces to match the tree level
for (int j = 0; j < height - i; j++) {
System.out.print(" ");
}
// third for loop to print out stars
for (int k = 0; k < (2 * i + 1); k++) {
System.out.print("*");
}
System.out.println();
}
// first for loop to determine amount of rows for bottom
for (int i = 0; i
// for loop to print the bottom part of the tree
for (int j = 0; j
System.out.print(" ");
}
for (int j = 0; j
System.out.print("*");
}
System.out.println();
}
}
}
выход:
Flat tree:
*******************
*******************
*******************
*******************
*******************
*******************
*******************
*******************
*******************
*******************
********
********
********
Xmas tree:
*
***
*****
*******
*********
***********
*************
***************
*****************
*******************
*******
*******
*******
*******
Объяснение: