C++ Program To Print Hollow Star Pyramid Diamond Shape Pattern

Here, we will build a C++ program to print the hollow star pyramid diamond shape pattern that can be achieved with two approaches i.e.

1. Using  for Loop
2. Using while loop

Input:

n = 5

Output:

 *
 * *
 * *
 * *
* *
 * *
 * *
 * *
 *

1. Using for loop

 *
 * *
 * *
 * *
* *
 * *
 * *
 * *
 *

Time complexity: O(n²) for given input n

Auxiliary Space: O(1)

2. Using while loop:

 *
 * *
 * *
 * *
* *
 * *
 * *
 * *
 *

Time complexity: O(rows*columns) 

Auxiliary Space: O(1)