Question

Write a program that reads an integer and displays, using asterisks, a filled diamond of the given side length. For example, if the side length is 4, the program should display[a diamond with the middle having 7 asterisks]
*

***

*****

*******

*****

***

*

Answer 1

Answer:

side = int(input("Please input side length of diamond: "))

# for loop that loop from 0 to n - 1

for i in range(side-1):

   # inside the print statement we determine the number of space to print

   # using n - 1 and repeat the space

   # we also determine the number of asterisk to print on a line

   # using 2 * i + 1

   print((side-i) * ' ' + (2*i+1) * '*')

# for loop that loop from 0 to n - 1 in reversed way

for i in range(side-1, -1, -1):

   # this print statement display the lower half of the diamond

   # it uses the same computation as the first for loop

   print((side-i) * ' ' + (2*i+1) * '*')

Explanation:

The program is written in Python and well commented. The first for loop display the first half of the diamond while the second for loop display the lower half.

A screenshot of program output when the code is executed is attached.

Answer 2

Answer:

1. import java.util.Scanner;
3. public class Main {
4.    public static void main(String[] args) {
5.        Scanner input = new Scanner(System.in);
6.        int n = input.nextInt();
7.        int l = 1;
8.        for(int i=1; i <= n; i++){
9.            for(int j=1; j<= l; j++){
10.                System.out.print("*");
11.            }
12.            System.out.println();
13.            l = l + 2;
14.        }
16.        l = l - 4;
17.        for(int i=1; i < n; i++){
18.            for(int j=1; j <= l; j++){
19.                System.out.print("*");
20.            }
21.            System.out.println();
22.            l = l-2;
23.        }
24.    }
25. }

Explanation:

The solution code is written in Java.

Firstly use a Scanner object to accept an input integer (Line 5-6).

Create the first set of inner loops to print the upper part of the diamond shape (Line 8-14). The variable l is to set the limit number of asterisk to be printed in each row.

Next, create another inner loops to print the lower part of the diamond shape (Line 17-23). The same variable l is used to set the limit number of asterisk to be printed in each row.