Double Pyramid using asterisk pattern

Implementing  Double Pyramid using an asterisk pattern in C++ language

Code:-

#include<iostream>
#include<cmath>
using namespace std;
int main()
{    
    // Ask User for value of N 
    cout<<"\nEnter the value of N:- \n";
	int n;

	// Read input
	cin>>n;

	// Print the upper pyramid
    // Uper pyramid is a decreasing pyramid with each increase in row no , the no of cols are decreased
    // For upper part n rows will be printed
    for(int row=1; row<=n; row++){  
 
        // for each row n-i characters will be printed
          for(int col=row; col<=n; col++){
                       
               // Print the character without adding new line
                cout<<"* ";
           }
                   
          // Print new line after printing the each row
          cout<<"\n";
    }
            
    // Print the lower pyramid 
    // Lower pyramid is an increasing pyramid with each increase in row no , the no of cols are increased
    // For lower part n-1 rows will be printed
    for(int row=n-1; row>=1; row--){
        
        // for each row i-n+1 characters will be printed
         for(int col=row; col<=n; col++){
                        
                // Print the character without adding new line
                cout<<"* ";
            }
            
         // Print new line after printing the each row
         cout<<"\n";
    }
}

You can also try this code with Online C++ Compiler

Run Code

Output 01:-

Enter the value of N:- 
5
* * * * * 
* * * * 
* * * 
* * 
* 
* * 
* * * 
* * * * 
* * * * * 

Output 02:-

Enter the value of N:- 
7
* * * * * * * 
* * * * * * 
* * * * * 
* * * * 
* * * 
* * 
* 
* * 
* * * 
* * * * 
* * * * * 
* * * * * * 
* * * * * * * 

Implementing  Double Pyramid using an asterisk pattern in Java language

Code:-

import java.util.Scanner;
public class Double_Pyramid{
    public static void main (String args[]){
        
            // Create Scanner Object for taking Input
            Scanner scan = new Scanner(System.in);
            
            // Ask User for value of N 
            System.out.print("Enter the value of n :- \n");
            
            // Read input with the scanner object
            int n = scan.nextInt();
            
            // Print the upper pyramid
            // Uper pyramid is a decreasing pyramid with each increase in row no , the no of cols   are decreased
            // For upper part n rows will be printed
            for(int row=1; row<=n; row++){   


                // for each row n-i characters will be printed
                  for(int col=row; col<=n; col++){
                       
                       // Print the character without adding new line
                        System.out.print("*"+" ");
                   }
                   
                  // Print new line after printing the each row
                  System.out.println();
            }
            
            // Print the lower pyramid 
            // Lower pyramid is an increasing pyramid with each increase in row no , the no of cols are increased
            // For lower part n-1 rows will be printed
            for(int row=n-1; row>=1; row--){
                // for each row i-n+1 characters will be printed
                 for(int col=row; col<=n; col++){
                        
                        // Print the character without adding new line
                        System.out.print("*"+" ");
                    }
            
                   // Print new line after printing the each row
                  System.out.println();
            }
        
        // Close the scanner object
        scan.close();
    }
}

You can also try this code with Online Java Compiler

Run Code

Output 01:-

Enter the value of n:- 
5
* * * * * 
* * * * 
* * * 
* * 
* 
* * 
* * * 
* * * * 
* * * * * 

Output 02:-

Enter the value of n:- 
7
* * * * * * * 
* * * * * * 
* * * * * 
* * * * 
* * * 
* * 
* 
* * 
* * * 
* * * * 
* * * * * 
* * * * * * 
* * * * * * * 

Implementing  Double Pyramid using an asterisk pattern in Python language

Code:-

# Ask User for value of N and Read input
n = int(input("Enter the value of N:- "))

# Print the upper Pyramid
# Upper pyramid is a decreasing pyramid with each increase in a row no, the no of cols are decreased
# For upper part n rows will be printed
for row in range(1,n+1,1):
 
    # Each row will print n-i characters
    for col in range(row,n+1,1):
 
        # Print the character without adding new line
        print("*",end=" ")
 
    # Print new line after printing each row
    print()

# Print the lower Pyramid 
# Lower Pyramid is an increasing pyramid with each increase in a row no, the no of cols are increased
#  Lower part will print n-1 rows
for row in range(n-1,0,-1):
    
    # Each row  will print i-n+1 characters
    for col in range(row,n+1,1):
    
        # Print the character without adding new line
        print("*",end=" ")
    
    # Print new line after printing each row
    print()  

You can also try this code with Online Python Compiler

Run Code

Output 01:-

Enter the value of N:- 5
* * * * * 
* * * * 
* * * 
* * 
* 
* * 
* * * 
* * * * 
* * * * * 

Output 02:-

Enter the value of N:- 7
* * * * * * * 
* * * * * * 
* * * * * 
* * * * 
* * * 
* * 
* 
* * 
* * * 
* * * * 
* * * * * 
* * * * * * 
* * * * * * * 

FAQs

1. What questions should one ask to solve a pattern?
   By answering the below three-question, one could solve many patterns. 
                 How many rows to print?
                 How many columns are in the ith row?
                 What to print?
   The answer to the above question gives you all the necessary information to print most of the patterns.
    
2. What is a Double Pyramid Pattern?
   A Double pyramid pattern combines two pyramid patterns, i.e. an increasing pyramid and a Decreasing pyramid. We first print the decreasing Pyramid than the increasing Pyramid to form our Double Pyramid.
    
3. Why is solving more pattern questions beneficial?
   Solving more and more pattern questions helps the programmer to enhance his knowledge and thinking capacity along with a better understanding of loops. To get a good hold of conditional and loop pattern solving is a must.

Key Takeaways

In the blog, we have extensively discussed the problem statement of Printing a Double pyramid using an asterisk pattern and solved the problem in  C, C++, Java and Python.

I hope this blog has helped you enhance your knowledge and understanding of data structures and algorithms. To solve more such problems visit our Mock Test Series in Code studio. Also, check out the coding ninja guided path for the top 150 interview puzzles. It contains all the essential puzzles usually asked in the interview. Try our Problem Section in Code Studio to be more confident in data structures and algorithms. All the best for your future interviews and Happy Coding till then.