Hollow Half Pyramid Pattern Using Numbers
Last Updated :
20 Mar, 2024
A hollow half-pyramid pattern using numbers is a type of pattern that seems like a pyramid shape mostly it is considered a star pattern but here we will be creating using numbers.Â
Hollow half-pyramid pattern using numbers
Program to print the following pattern of a half pyramid for N.
Example:Â
Input: N = 5
1
1 2
1 3
1 4
1 2 3 4 5
Below is the implementation of the above approach:
C++
// C++ program print hollow half pyramid
// pattern using numbers
#include <iostream>
using namespace std;
void pattern(int N)
{
int i, j, k = 0;
// loop to print number from 1 to N
for (i = 1; i <= N; i++) {
// For loop to display number upto i
for (j = 1; j <= i; j++) {
if (j == 1 || j == i || i == N)
cout << j << " ";
else
cout << " ";
}
cout << endl;
}
}
// Driver Code
int main()
{
int N = 5;
// Function Call
pattern(N);
return 0;
}
C
// C program print hollow half pyramid
// pattern using numbers
#include <stdio.h>
// Pattern function
void pattern(int N)
{
int i, j, k = 0;
// loop to print number from 1 to N
for (i = 1; i <= N; i++) {
// For loop to display number upto i
for (j = 1; j <= i; j++) {
if (j == 1 || j == i || i == N)
printf("%d ", j);
else
printf(" ");
}
printf("\n");
}
}
// Driver Code
int main()
{
int N = 5;
// Function Call
pattern(N);
return 0;
}
Java
// Java program print hollow half pyramid
// pattern using numbers
import java.io.*;
class GFG {
// Pattern function
static void pattern(int N)
{
int i, j, k = 0;
// loop to print number from 1 to N
for (i = 1; i <= N; i++) {
// For loop to display number upto i
for (j = 1; j <= i; j++) {
if (j == 1 || j == i || i == N)
System.out.print(j + " ");
else
System.out.print(" ");
}
System.out.println();
}
}
// Main Function
public static void main(String[] args)
{
// Variable declared
int N = 5;
// Pattern function called
pattern(N);
}
}
C#
using System;
class Program
{
static void Pattern(int N)
{
// Loop to print numbers from 1 to N
for (int i = 1; i <= N; i++)
{
// For loop to display numbers up to i
for (int j = 1; j <= i; j++)
{
if (j == 1 || j == i || i == N)
Console.Write(j + " ");
else
Console.Write(" ");
}
Console.WriteLine();
}
}
static void Main(string[] args)
{
int N = 5;
// Function Call
Pattern(N);
}
}
Javascript
// Function to print a hollow
// half pyramid pattern using numbers
function printHollowHalfPyramid(N) {
// Loop to print numbers from 1 to N
for (let i = 1; i <= N; i++) {
// Loop to display numbers up to i
for (let j = 1; j <= i; j++) {
// Print number if it's the first or last one in the row or if it's the last row
if (j === 1 || j === i || i === N) {
process.stdout.write(`${j} `); // Use process.stdout.write() to print without a newline
} else {
process.stdout.write(" "); // Print two spaces for hollow parts
}
}
// Move to a new line after each row is printed
process.stdout.write("\n");
}
}
// Main code block
let N = 5; // Define the size of the pyramid
printHollowHalfPyramid(N); // Call the function to print the pattern
Python3
# Python program print hollow half pyramid
# pattern using numbers
# pattern function
def pattern(N):
for i in range(1, N+1):
for j in range(1, i+1):
if j == 1 or j == i or i == N:
print(j, end=" ")
else:
print(" ", end=" ")
print()
# Driver code
if __name__ == "__main__":
N = 5
pattern(N)
Time complexity O(N2)Â
Reason: we are looping through the rows and columns of the pattern.
Space complexity O(1)
Reason: This algorithm does not require any additional space.
Hollow Inverted Half Pyramid Pattern using numbers
Printing an Inverted pyramid of a pattern is mostly the same as printing the pyramid normally just changes in a few conditions and we are all done. Let us check the code.
Example:Â
input: N = 6
1 2 3 4 5 6
2 6Â
3 6
4 6
5 6
6
C++
// C++ program to print hollow inverted half pyramid
// pattern using numbers
#include <iostream>
using namespace std;
void pattern(int N)
{
int i, j, k = 0;
// loop to print number from 1 to N
for (i = 1; i <= N; i++) {
// For loop to display number from i to N
for (j = i; j <= N; j++) {
if (i == 1 || j == i || j == N)
cout << j << " ";
else
cout << " ";
}
cout << endl;
}
}
// Driver Code
int main()
{
int N = 6;
// Function Call
pattern(N);
return 0;
}
C
// C program to print hollow inverted half pyramid
// pattern using numbers
#include <stdio.h>
void pattern(int N)
{
int i, j, k = 0;
// loop to print number from 1 to N
for (i = 1; i <= N; i++) {
// For loop to display number from i to N
for (j = i; j <= N; j++) {
if (i == 1 || j == i || j == N)
printf("%d ", j);
else
printf(" ");
}
printf("\n");
}
}
// Driver Code
int main()
{
int N = 6;
// Function Call
pattern(N);
return 0;
}
Java
// Java program to print hollow inverted half pyramid
// pattern using numbers
import java.io.*;
// Driver Class
class GFG {
static void pattern(int N)
{
int i, j, k = 0;
// loop to print number from 1 to N
for (i = 1; i <= N; i++) {
// For loop to display number from i to N
for (j = i; j <= N; j++) {
if (i == 1 || j == i || j == N)
System.out.print(j + " ");
else
System.out.print(" ");
}
System.out.println();
}
}
// Main function
public static void main(String[] args)
{
int N = 6;
// Pattern function called
pattern(N);
}
}
C#
// C# program for the above approach
using System;
public class GFG {
// Function to print hollow inverted half pyramid
// pattern using numbers
static void Pattern(int N)
{
// loop to print number from 1 to N
for (int i = 1; i <= N; i++) {
// For loop to display number from i to N
for (int j = i; j <= N; j++) {
if (i == 1 || j == i || j == N)
Console.Write(j + " ");
else
Console.Write(" ");
}
Console.WriteLine();
}
}
// Driver Code
public static void Main()
{
int N = 6;
// Function Call
Pattern(N);
}
}
// This code is contributed by Susobhan Akhuli
Javascript
// Function to print a hollow inverted
// half pyramid pattern using numbers
function printHollowInvertedHalfPyramid(N) {
// Loop to print numbers from 1 to N
for (let i = 1; i <= N; i++) {
// Loop to display numbers from i to N
for (let j = i; j <= N; j++) {
// Print number if it's the first row, or if it's on the diagonal, or if it's on the last column
if (i === 1 || j === i || j === N) {
process.stdout.write(`${j} `); // Use process.stdout.write() to print without a newline
} else {
process.stdout.write(" "); // Print two spaces for hollow parts
}
}
// Move to a new line after each row is printed
process.stdout.write("\n");
}
}
// Main code block
let N = 6; // Define the size of the pyramid
printHollowInvertedHalfPyramid(N); // Call the function to print the pattern
Python3
# python program to print hollow inverted half pyramid
# pattern using numbers
#pattern function
def pattern(N):
for i in range(1, N+1):
for j in range(i, N+1):
if i == 1 or j == i or j == N:
print(j, end=" ")
else:
print(" ", end=" ")
print()
# Driver code
if __name__ == "__main__":
N = 6
pattern(N)
Time complexity O(N2)Â
Reason: we are looping through the rows and columns of the pattern.
Space complexity O(1)
Reason: This algorithm does not require any additional space.
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