Full Pyramid Number Pattern: Part1

Example

Input

Number of rows: 5

Output

        1

      321

    54321

  7654321

987654321

Explanation

Here we can see that for the number of rows = 5, a pyramid is printed such that numbers are consecutive and in descending order ending at 1 in every row.

Approach

Firstly we will take the input for the number of rows. And to print the full pyramid number pattern, we will use two for loops. And, we will calculate the number of times both the loops should run and what they should it print.

• If the number of rows is n, then the outer loop will run for n times, and there will be two inner loops. 
• One inner loop will ensure the spaces before the starting number of every row. 
• The number of spaces will be n-i for the ith row. 
• And the second inner loop will be printing the numbers in reverse order till 1. 
• We can notice that the number at starting of ith row should be 2i-1 as per the given example in the problem statement section.

Program in C++

Now we will solve this problem on how to print the full pyramid number pattern in reverse order by taking the number of rows as inputs from the user in C++.

Code

#include<bits/stdc++.h>
using namespace std;
int main() {
	int n;
	cout<<"Number of rows: ";
	cin>>n;
	
	for(int i =1;i<=n;i++){
		int y=n-i,z=2*i;
		for(int j=0;j<y;j++){
			cout<<" ";
		}
		z--;
		for(int j=z;j>=1;j--){
			cout<<j;
		}
		cout<<"\n";
	}
	return 0;
}

Output

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Program in C

Now we will solve this problem on how to print the full pyramid number pattern in reverse order by taking the number of rows as inputs from the user in C.

Code

#include<stdio.h>

int main() {
	int n=0;
	printf("Number of rows: ");
	scanf("%d",&n);
	int i=0,j=0;
	for(i=1;i<=n;i++){
		int y=n-i,z=2*i;
		for(j=0;j<y;j++){
			printf(" ");
		}
		z--;
		for(j=z;j>=1;j--){
			printf("%d",j);
		}
		printf("\n");
	}
	return 0;
}

Output

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Program in Java

Now we will solve this problem on how to print the full pyramid number pattern in reverse order by taking the number of rows as inputs from the user in java.

Code

import java.util.*;  
class CodingNinjas  
{  
    public static void main(String[] args)  
    {  
        Scanner sc= new Scanner(System.in);
        System.out.print("Number of rows: ");
        int n=sc.nextInt();
       
        for(int i=1;i<=n;i++){
            int y=n-i,z=2*i;
            for(int j=0;j<y;j++){
                System.out.print(" ");
            }
            z--;
            for(int j=z;j>=1;j--){
                System.out.print(j);
            }
            System.out.println();
        }
        sc.close();
    }  
}

Output

If you want to learn Java from basic level to completion check out our, Guided path for learning Java.

Program in Python

Now we will solve this problem on how to print the full pyramid number pattern in reverse order by taking the number of rows as inputs from the user in python.

Code

n=int(input("Number of rows: "))
for i in range(1,n+1):
    y=n-i
    z=(2*i)-1
    for j in range(y):
        print(" ",end="")
    for j in range(z,0,-1):
        print(j,end="")
    print()

Output

If you want to learn Python from basic level to completion check out our, Guided path for learning Python

You can also check out the Full Pyramid Number Pattern: Part 2 and the Full Pyramid Number Pattern: Part 3

Also Read - Strong number in c

FAQs

1. What is the benefit of pattern puzzles?
   Solving a pattern puzzle is the best way to learn the use of loop statements and practice some logical problems.
    
2. What will be the time complexity of the full pyramid number pattern part 1?
   O(n²) will be the time complexity because the inner loops will run ((n)+(n-1)+...+1) times which is n*(n+1)/2. So, the time complexity is O(n²).
    
3. What will be the space complexity of the full pyramid number pattern part 1?
   O(1) will be the space complexity because no extra space was used.

Key Takeaways

In this article, we have extensively discussed how to print the full pyramid number pattern in reverse order in C++, C,  Java, and python.

We hope that this blog has helped you enhance your knowledge on how to print the full pyramid number pattern in reverse order, and if you would like to learn more, check out our problems, test series, and top 150 interview puzzles. Do upvote our blog to help other ninjas grow. Happy Coding!