# Program to Print Right Half Pyramid Pattern (Star Pattern)

Last Updated : 29 Jan, 2024

Given an integer N, print N rows of right half pyramid pattern. In right half pattern of N rows, the first row has 1 star, second row has 2 stars and so on till the Nth row which has N stars. All the stars are left aligned.

Examples:

Input: 3
Output:
*
**
***

Input: 5
Output:
*
**
***
****
*****

Approach:

The problem can be solved using two nested loops. The outer loop will run for the rows and the inner loop will print the stars.

Step-by-step approach:

• Run an outer loop from i = 1 to the number of rows.
• Run an inner loop from j = 1 to i.
• Print an asterisk in each iteration of the inner loop.
• Print a newline character (“\n”) to move to the next row.
• After N iterations, we will have the right half pyramid pattern.

Below is the implementation of the above approach:

## C++

 `#include ` `using` `namespace` `std;`   `int` `main()` `{` `    ``// Number of rows` `    ``int` `N = 5;`   `    ``// Outer loop runs N times, once for each row` `    ``for` `(``int` `i = 1; i <= N; i++) {` `        ``// Inner loop prints 'i' stars` `        ``for` `(``int` `j = 1; j <= i; j++) {` `            ``cout << ``"*"``;` `        ``}` `        ``// Move to the next line` `        ``cout << ``"\n"``;` `    ``}`   `    ``return` `0;` `}`

## Java

 `import` `java.util.Scanner;`   `public` `class` `Main {` `    ``public` `static` `void` `main(String[] args)` `    ``{`   `        ``// Number of rows` `        ``int` `N = ``5``;`   `        ``// Outer loop runs N times, once for each row` `        ``for` `(``int` `i = ``1``; i <= N; i++) {` `            ``// Inner loop prints 'i' stars` `            ``for` `(``int` `j = ``1``; j <= i; j++) {` `                ``System.out.print(``"*"``);` `            ``}` `            ``// Move to the next line` `            ``System.out.println();` `        ``}` `    ``}` `}`

## Python3

 `# Number of rows` `N ``=` `5`   `# Outer loop runs N times, once for each row` `for` `i ``in` `range``(``1``, N ``+` `1``):` `    ``# Inner loop prints 'i' stars` `    ``for` `j ``in` `range``(``1``, i ``+` `1``):` `        ``print``(``"*"``, end``=``"")` `    ``# Move to the next line` `    ``print``()`

## C#

 `using` `System;`   `class` `Program` `{` `    ``static` `void` `Main()` `    ``{` `        ``// Number of rows` `        ``int` `N = 5;`   `        ``// Outer loop runs N times, once for each row` `        ``for` `(``int` `i = 1; i <= N; i++)` `        ``{` `            ``// Inner loop prints 'i' stars` `            ``for` `(``int` `j = 1; j <= i; j++)` `            ``{` `                ``Console.Write(``"*"``);` `            ``}` `            ``// Move to the next line` `            ``Console.WriteLine();` `        ``}` `    ``}` `}`

## Javascript

 `// Number of rows` `let N = 5;`   `// Outer loop runs N times, once for each row` `for` `(let i = 1; i <= N; i++) {` `    ``// Inner loop prints 'i' stars` `    ``for` `(let j = 1; j <= i; j++) {` `        ``process.stdout.write(``"*"``);` `    ``}` `    ``// Move to the next line` `    ``console.log();` `}`

Output

```*
**
***
****
*****

```

Time Complexity: O(N2), where N is the number of rows in the pattern.
Auxiliary Space: O(1)

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