Posted on by Kalkicode
Code Pattern

Print the R pattern

In this article, we will discuss a program to print the R pattern using stars (*) and spaces. The program is implemented in C language and follows a simple algorithm to generate the desired pattern.

Problem Statement

The problem is to print the letter 'R' using stars in a pattern. The pattern should be formed by a combination of stars and spaces. The height of the 'R' pattern is provided as input to the program.

The program should satisfy the following conditions:

  1. The height of the pattern should be an odd number greater than or equal to 3.
  2. The pattern should resemble the uppercase letter 'R'.

Example

Let's consider an example to understand the problem and its solution.

If the height of the pattern is 7, the output should be:

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

Algorithm

  1. Start the program.
  2. Define a function 'print_star' that takes the size as an input parameter.
  3. Initialize a counter to 0.
  4. Run a loop from 0 to size-1: a. Check if the counter is even: i. If true, print a star (*) character. ii. If false, print a space character. b. Increment the counter by 1.
  5. Define another function 'print_space' that takes the size as an input parameter.
  6. Initialize a counter to 0.
  7. Run a loop from 0 to size-1: a. Print a space character. b. Increment the counter by 1.
  8. Define a function 'show_r' that takes the height as an input parameter.
  9. Check if the height is less than 3 or an even number: a. If true, return from the function.
  10. Print the height value.
  11. Run a loop from 0 to height-1: a. Check if the current index is either 0 or height/2: i. If true, call the 'print_star' function passing the height as a parameter. - This will print a row of stars in the horizontal direction. ii. Call the 'print_space' function passing 3 as a parameter. - This will print 3 spaces after the row of stars. b. Else: i. Print a star () character. ii. Call the 'print_space' function passing height-1 as a parameter. - This will print spaces after the boundary star. iii. Print a star () character. iv. Call the 'print_space' function passing 2 as a parameter. - This will print 2 spaces after the boundary star.
  12. Print a new line.
  13. Implement the main function.
  14. Call the 'show_r' function with different height values to test the program.
  15. End the program.

Code Solution

Here given code implementation process.

//C Program 
//Print R pattern
#include <stdio.h>

//Include star of given size
void print_star(int size)
{
	int counter = 0;
	for (counter = 0; counter < size; counter++)
	{
		if (counter % 2 == 0)
		{
			//Add Star
			printf("*");
		}
		else
		{
			//Add Space
			printf(" ");
		}
	}
}
//Display space of given size
void print_space(int size)
{
	int counter = 0;
	for (counter = 0; counter < size; counter++)
	{
		//Add space
		printf(" ");
	}
}
//Print 'R' star pattern of given size
void show_r(int height)
{
	if (height < 3 || height % 2 == 0)
	{
		return;
	}
	printf("\nHeight : %d  \n\n", height);
	for (int i = 0; i < height; ++i)
	{
		if (i == 0 || i == height / 2)
		{
			//when printed the star in horizontal direction
			print_star(height);
			print_space(3);
		}
		else
		{
			//print boundary elements
			printf("*");
			print_space(height - 1);
			printf("*");
			print_space(2);
		}
		printf("\n");
	}
}
int main()
{
	//Simple test
	show_r(7);
	show_r(9);
	show_r(3);
	show_r(15);
	return 0;
}

Output

Height : 7

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

Height : 9

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

Height : 3

* *
* *
*  *

Height : 15

* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
*              *
/*
  Java Program
  Print R star pattern
*/
class MyPattern
{
	//Include star of given size
	public void print_star(int size)
	{
		int counter = 0;
		for (counter = 0; counter < size; counter++)
		{
			if (counter % 2 == 0)
			{
				//Add Star
				System.out.print("*");
			}
			else
			{
				//Add Space
				System.out.print(" ");
			}
		}
	}
	//Display space of given size
	public void print_space(int size)
	{
		int counter = 0;
		for (counter = 0; counter < size; counter++)
		{
			//Add space
			System.out.print(" ");
		}
	}
	//Print 'R' star pattern of given size
	public void show_r(int height)
	{
		if (height < 3 || height % 2 == 0)
		{
			return;
		}
		System.out.print("\nHeight : " + height + " \n\n");
		for (int i = 0; i < height; ++i)
		{
			if (i == 0 || i == height / 2)
			{
				//when printed the star in horizontal direction
				print_star(height);
				print_space(3);
			}
			else
			{
				//print boundary elements
				System.out.print("*");
				print_space(height - 1);
				System.out.print("*");
				print_space(2);
			}
			System.out.print("\n");
		}
	}
	public static void main(String[] args)
	{
		MyPattern obj = new MyPattern();
		//Simple test
		obj.show_r(7);
		obj.show_r(9);
		obj.show_r(3);
		obj.show_r(15);
	}
}

Output

Height : 7

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

Height : 9

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

Height : 3

* *
* *
*  *

Height : 15

* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
*              *
/*
  C++ Program
  Print R star pattern
*/
#include<iostream>

using namespace std;
class MyPattern
{
	public:
		//Include star of given size
		void print_star(int size)
		{
			int counter = 0;
			for (counter = 0; counter < size; counter++)
			{
				if (counter % 2 == 0)
				{
					cout << "*";
				}
				else
				{
					cout << " ";
				}
			}
		}
	//Display space of given size
	void print_space(int size)
	{
		int counter = 0;
		for (counter = 0; counter < size; counter++)
		{
			cout << " ";
		}
	}
	//Print 'R' star pattern of given size
	void show_r(int height)
	{
		if (height < 3 || height % 2 == 0)
		{
			return;
		}
		cout << "\nHeight : " << height << " \n\n";
		for (int i = 0; i < height; ++i)
		{
			if (i == 0 || i == height / 2)
			{
				//when printed the star in horizontal direction
				this->print_star(height);
				this->print_space(3);
			}
			else
			{
				cout << "*";
				this->print_space(height - 1);
				cout << "*";
				this->print_space(2);
			}
			cout << "\n";
		}
	}
};
int main()
{
	MyPattern obj =  MyPattern();
	//Simple test
	obj.show_r(7);
	obj.show_r(9);
	obj.show_r(3);
	obj.show_r(15);
	return 0;
}

Output

Height : 7

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

Height : 9

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

Height : 3

* *
* *
*  *

Height : 15

* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
*              *
/*
  C# Program
  Print R star pattern
*/
using System;
class MyPattern
{
	//Include star of given size
	public void print_star(int size)
	{
		int counter = 0;
		for (counter = 0; counter < size; counter++)
		{
			if (counter % 2 == 0)
			{
				//Add Star
				Console.Write("*");
			}
			else
			{
				//Add Space
				Console.Write(" ");
			}
		}
	}
	//Display space of given size
	public void print_space(int size)
	{
		int counter = 0;
		for (counter = 0; counter < size; counter++)
		{
			//Add space
			Console.Write(" ");
		}
	}
	//Print 'R' star pattern of given size
	public void show_r(int height)
	{
		if (height < 3 || height % 2 == 0)
		{
			return;
		}
		Console.Write("\nHeight : " + height + " \n\n");
		for (int i = 0; i < height; i++)
		{
			if (i == 0 || i == height / 2)
			{
				//when printed the star in horizontal direction
				print_star(height);
				print_space(3);
			}
			else
			{
				//print boundary elements
				Console.Write("*");
				print_space(height - 1);
				Console.Write("*");
				print_space(2);
			}
			Console.Write("\n");
		}
	}
	public static void Main(String[] args)
	{
		MyPattern obj = new MyPattern();
		//Simple test
		obj.show_r(7);
		obj.show_r(9);
		obj.show_r(3);
		obj.show_r(15);
	}
}

Output

Height : 7

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

Height : 9

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

Height : 3

* *
* *
*  *

Height : 15

* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
*              *
<?php
/*
  Php Program
  Print R star pattern
*/
class MyPattern
{
	//Include star of given size
	public	function print_star($size)
	{
		$counter = 0;
		for ($counter = 0; $counter < $size; $counter++)
		{
			if ($counter % 2 == 0)
			{
				//Add Star
				echo("*");
			}
			else
			{
				//Add Space
				echo(" ");
			}
		}
	}
	//Display space of given size
	public	function print_space($size)
	{
		$counter = 0;
		for ($counter = 0; $counter < $size; $counter++)
		{
			//Add space
			echo(" ");
		}
	}
	//Print 'R' star pattern of given size
	public	function show_r($height)
	{
		if ($height < 3 || $height % 2 == 0)
		{
			return;
		}
		echo("\nHeight : ". $height ." \n\n");
		for ($i = 0; $i < $height; ++$i)
		{
			if ($i == 0 || $i == intval($height / 2))
			{
				//when printed the star in horizontal direction
				$this->print_star($height);
				$this->print_space(3);
			}
			else
			{
				//print boundary elements
				echo("*");
				$this->print_space($height - 1);
				echo("*");
				$this->print_space(2);
			}
			echo("\n");
		}
	}
}

function main()
{
	$obj = new MyPattern();
	//Simple test
	$obj->show_r(7);
	$obj->show_r(9);
	$obj->show_r(3);
	$obj->show_r(15);
}
main();

Output

Height : 7

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

Height : 9

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

Height : 3

* *
* *
*  *

Height : 15

* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
*              *
/*
  Node Js Program
  Print R star pattern
*/
class MyPattern
{
	//Include star of given size
	print_star(size)
	{
		var counter = 0;
		for (counter = 0; counter < size; counter++)
		{
			if (counter % 2 == 0)
			{
				//Add Star
				process.stdout.write("*");
			}
			else
			{
				//Add Space
				process.stdout.write(" ");
			}
		}
	}
	//Display space of given size
	print_space(size)
	{
		var counter = 0;
		for (counter = 0; counter < size; counter++)
		{
			//Add space
			process.stdout.write(" ");
		}
	}
	//Print 'R' star pattern of given size
	show_r(height)
	{
		if (height < 3 || height % 2 == 0)
		{
			return;
		}
		process.stdout.write("\nHeight : " + height + " \n\n");
		for (var i = 0; i < height; ++i)
		{
			if (i == 0 || i == parseInt(height / 2))
			{
				//when printed the star in horizontal direction
				this.print_star(height);
				this.print_space(3);
			}
			else
			{
				//print boundary elements
				process.stdout.write("*");
				this.print_space(height - 1);
				process.stdout.write("*");
				this.print_space(2);
			}
			process.stdout.write("\n");
		}
	}
}

function main(args)
{
	var obj = new MyPattern();
	//Simple test
	obj.show_r(7);
	obj.show_r(9);
	obj.show_r(3);
	obj.show_r(15);
}
main();

Output

Height : 7

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

Height : 9

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

Height : 3

* *
* *
*  *

Height : 15

* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
*              *
# Python 3 Program
# Print R star pattern

class MyPattern :
	# Include star of given size
	def print_star(self, size) :
		counter = 0
		while (counter < size) :
			if (counter % 2 == 0) :
				print("*", end = "")
			else :
				print(" ", end = "")
			
			counter += 1
		
	
	# Display space of given size
	def print_space(self, size) :
		counter = 0
		while (counter < size) :
			print(" ", end = "")
			counter += 1
		
	
	# Print 'R' star pattern of given size
	def show_r(self, height) :
		if (height < 3 or height % 2 == 0) :
			return
		
		print("\nHeight : ", height ," \n\n", end = "")
		i = 0
		while (i < height) :
			if (i == 0 or i == int(height / 2)) :
				# when printed the star in horizontal direction
				self.print_star(height)
				self.print_space(3)
			else :
				print("*", end = "")
				self.print_space(height - 1)
				print("*", end = "")
				self.print_space(2)
			
			print("\n", end = "")
			i += 1
		
	

def main() :
	obj = MyPattern()
	# Simple test
	obj.show_r(7)
	obj.show_r(9)
	obj.show_r(3)
	obj.show_r(15)


if __name__ == "__main__": main()

Output

Height :  7

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

Height :  9

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

Height :  3

* *
* *
*  *

Height :  15

* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
*              *
# Ruby Program
# Print R star pattern

class MyPattern

	# Include star of given size
	def print_star(size)
	
		counter = 0
		while (counter < size)
		
			if (counter % 2 == 0)
			
				print("*")
			else
			
				print(" ")
			end
			counter += 1
		end
	end
	# Display space of given size
	def print_space(size)
	
		counter = 0
		while (counter < size)
		
			print(" ")
			counter += 1
		end
	end
	# Print 'R' star pattern of given size
	def show_r(height)
	
		if (height < 3 || height % 2 == 0)
		
			return
		end
		print("\nHeight : ", height ," \n\n")
		i = 0
		while (i < height)
		
			if (i == 0 || i == height / 2)
			
				# when printed the star in horizontal direction
				self.print_star(height)
				self.print_space(3)
			else
			
				print("*")
				self.print_space(height - 1)
				print("*")
				self.print_space(2)
			end
			print("\n")
			i += 1
		end
	end
end
def main()

	obj = MyPattern.new()
	# Simple test
	obj.show_r(7)
	obj.show_r(9)
	obj.show_r(3)
	obj.show_r(15)
end
main()

Output

Height : 7 

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

Height : 9 

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

Height : 3 

* *   
* *   
*  *  

Height : 15 

* * * * * * * *   
*              *  
*              *  
*              *  
*              *  
*              *  
*              *  
* * * * * * * *   
*              *  
*              *  
*              *  
*              *  
*              *  
*              *  
*              *  
/*
  Scala Program
  Print R star pattern
*/
class MyPattern
{
	//Include star of given size
	def print_star(size: Int): Unit = {
		var counter: Int = 0;
		while (counter < size)
		{
			if (counter % 2 == 0)
			{
				print("*");
			}
			else
			{
				print(" ");
			}
			counter += 1;
		}
	}
	//Display space of given size
	def print_space(size: Int): Unit = {
		var counter: Int = 0;
		while (counter < size)
		{
			print(" ");
			counter += 1;
		}
	}
	//Print 'R' star pattern of given size
	def show_r(height: Int): Unit = {
		if (height < 3 || height % 2 == 0)
		{
			return;
		}
		print("\nHeight : " + height + " \n\n");
		var i: Int = 0;
		while (i < height)
		{
			if (i == 0 || i == (height / 2).toInt)
			{
				//when printed the star in horizontal direction
				print_star(height);
				print_space(3);
			}
			else
			{
				print("*");
				print_space(height - 1);
				print("*");
				print_space(2);
			}
			print("\n");
			i += 1;
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var obj: MyPattern = new MyPattern();
		//Simple test
		obj.show_r(7);
		obj.show_r(9);
		obj.show_r(3);
		obj.show_r(15);
	}
}

Output

Height : 7

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

Height : 9

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

Height : 3

* *
* *
*  *

Height : 15

* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
* * * * * * * *
*              *
*              *
*              *
*              *
*              *
*              *
*              *
/*
  Swift Program
  Print R star pattern
*/
class MyPattern
{
	//Include star of given size
	func print_star(_ size: Int)
	{
		var counter: Int = 0;
		while (counter < size)
		{
			if (counter % 2 == 0)
			{
				print("*", terminator: "");
			}
			else
			{
				print(" ", terminator: "");
			}
			counter += 1;
		}
	}
	//Display space of given size
	func print_space(_ size: Int)
	{
		var counter: Int = 0;
		while (counter < size)
		{
			print(" ", terminator: "");
			counter += 1;
		}
	}
	//Print "R" star pattern of given size
	func show_r(_ height: Int)
	{
		if (height < 3 || height % 2 == 0)
		{
			return;
		}
		print("\nHeight : ", height ," \n\n", terminator: "");
		var i: Int = 0;
		while (i < height)
		{
			if (i == 0 || i == height / 2)
			{
				//when printed the star in horizontal direction
				self.print_star(height);
				self.print_space(3);
			}
			else
			{
				print("*", terminator: "");
				self.print_space(height - 1);
				print("*", terminator: "");
				self.print_space(2);
			}
			print("\n", terminator: "");
			i += 1;
		}
	}
}
func main()
{
	let obj: MyPattern = MyPattern();
	//Simple test
	obj.show_r(7);
	obj.show_r(9);
	obj.show_r(3);
	obj.show_r(15);
}
main();

Output

Height :  7

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

Height :  9

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

Height :  3

* *
* *
*  *

Height :  15

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

Comment

Please share your knowledge to improve code and content standard. Also submit your doubts, and test case. We improve by your feedback. We will try to resolve your query as soon as possible.

New Comment