Program for Arrow Star Pattern

0 0 5 minutes read

Given the value of n, print the pattern.
Examples :

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

Input : 7
Output : 
      *******
     ******
    *****
   ****
  ***
 **
*
 **
  ***
   ****
    *****
     ******
      *******

Below is the implementation to print the above pattern :

C++

// C++ Implementation to print the pattern 
  
#include <bits/stdc++.h> 
using namespace std; 
  
// arrow function  
int arrow(int n) 
{ 
    // Prints the upper part of the arrow 
    for (int i = 1; i <= n; i++)  
    { 
        // for the spacing to form 
        // the point of the arrow 
        for (int j = i; j < n; j++)  
        { 
            printf(" "); 
        } 
          
        // for printing the star(*) 
        for (int j = i; j <= n; j++)  
        { 
            cout << "*"; 
        } 
        cout << endl; 
    } 
      
    // Prints lower part of the arrow 
    for (int i = 2; i <= n; i++) 
    { 
        // for the spacing to form 
        // the point of the arrow 
        for (int j = 1; j < i; j++)  
        { 
            printf(" "); 
        } 
          
        // for printing the star(*) 
        for (int j = 1; j <= i; j++)  
        { 
            cout << "*"; 
        } 
        cout << endl; 
    } 
} 
  
// driver code 
int main() 
{ 
    // get the value from user 
    int n = 5; 
      
    // function calling 
    arrow(n); 
  
    return 0; 
} 

Java

// Java Implementation to 
// print the above pattern 
import java.io.*; 
  
class GFG { 
  
// arrow function  
static void arrow(int n) 
{ 
    // Prints the upper part of the arrow 
    for (int i = 1; i <= n; i++)  
    { 
        // for the spacing to form 
        // the point of the arrow 
        for (int j = i; j < n; j++)  
        { 
            System.out.print(" "); 
        } 
          
        // for printing the star(*) 
        for (int j = i; j <= n; j++)  
        { 
            System.out.print("*"); 
        } 
              
    System.out.println(); 
    } 
      
    // Prints lower part of the arrow 
    for (int i = 2; i <= n; i++) 
    { 
        // for the spacing to form 
        // the point of the arrow 
        for (int j = 1; j < i; j++)  
        { 
            System.out.print(" "); 
        } 
          
        // for printing the star(*) 
        for (int j = 1; j <= i; j++)  
        { 
            System.out.print("*"); 
        } 
    System.out.print('\n'); 
    } 
} 
  
// driver code 
public static void main(String[] Argv) { 
      
    // get the value from user 
    int n = 5; 
      
    // function calling 
    arrow(n); 
} 
} 
  
// this code is contributed by 'vt_m' 

Python3

# Python Implementation to  
# print the pattern 
   
# arrow function  
def arrow(n): 
  
    # Prints the upper part of the arrow 
    for i in range(1, n+1):  
      
        # for the spacing to form 
        # the point of the arrow 
        for j in range(i, n):  
          
            print(" ", end="") 
          
        # for printing the star(*) 
        for j in range(i, n+1):  
          
            print("*", end="") 
          
        print() 
       
    # Prints lower part of the arrow 
    for i in range(2, n+1): 
      
        # for the spacing to form 
        # the point of the arrow 
        for j in range(1, i):  
          
            print(" ", end="") 
          
        # for printing the star(*) 
        for j in range(1, i+1):  
          
            print("*", end="") 
          
        print() 
   
# driver code 
# get the value from the user 
n = 5
       
# function calling 
arrow(n) 
  
# This code is contributed  
# by Anant Agarwal. 

C#

// C# Implementation to 
// print the above pattern 
using System; 
  
class GFG { 
  
// arrow function  
static void arrow(int n) 
{ 
    // Prints the upper part of the arrow 
    for (int i = 1; i <= n; i++)  
    { 
        // for the spacing to form 
        // the point of the arrow 
        for (int j = i; j < n; j++)  
        { 
            Console.Write(" "); 
        } 
          
        // for printing the star(*) 
        for (int j = i; j <= n; j++)  
        { 
            Console.Write("*"); 
        } 
              
           Console.WriteLine(); 
    } 
      
    // Prints lower part of the arrow 
    for (int i = 2; i <= n; i++) 
    { 
        // for the spacing to form 
        // the point of the arrow 
        for (int j = 1; j < i; j++)  
        { 
            Console.Write(" "); 
        } 
          
        // for printing the star(*) 
        for (int j = 1; j <= i; j++)  
        { 
            Console.Write("*"); 
        } 
         Console.WriteLine(); 
    } 
} 
  
// driver code 
public static void Main() { 
      
    // get the value from user 
    int n = 5; 
      
    // function calling 
    arrow(n); 
} 
} 
  
// this code is contributed by 'vt_m' 

PHP

<?php 
// PHP Implementation to print 
// the pattern 
  
function arrow($n) 
{ 
    // Prints the upper part of  
    // the arrow 
    for ($i = 1; $i <= $n; $i++)  
    { 
        // for the spacing to form 
        // the point of the arrow 
        for ($j = $i; $j < $n; $j++)  
        { 
            echo " "; 
        } 
          
        // for printing the star(*) 
        for ($j = $i; $j <= $n; $j++)  
        { 
            echo "*"; 
        } 
        echo "\n"; 
    } 
      
    // Prints lower part of the arrow 
    for ($i = 2; $i <= $n; $i++) 
    { 
        // for the spacing to form 
        // the point of the arrow 
        for ($j = 1; $j < $i; $j++)  
        { 
            echo " "; 
        } 
          
        // for printing the star(*) 
        for ($j = 1; $j <= $i; $j++)  
        { 
            echo "*"; 
        } 
        echo "\n"; 
    } 
} 
  
// Driver code 
$n = 5; 
arrow($n); 
  
// This code is contributed by mits 
?> 

Javascript

<script> 
  
      // JavaScript Implementation  
      // to print the pattern 
  
      // arrow function 
      function arrow(n) 
      { 
        // Prints the upper part of the arrow 
        for (var i = 1; i <= n; i++)  
        { 
          // for the spacing to form 
          // the point of the arrow 
          for (var j = i; j < n; j++)  
          { 
            document.write("  "); 
          } 
  
          // for printing the star(*) 
          for (var j = i; j <= n; j++)  
          { 
            document.write("*"); 
          } 
          document.write("<br>"); 
        } 
  
        // Prints lower part of the arrow 
        for (var i = 2; i <= n; i++) 
        { 
          // for the spacing to form 
          // the point of the arrow 
          for (var j = 1; j < i; j++) { 
            document.write("  "); 
          } 
  
          // for printing the star(*) 
          for (var j = 1; j <= i; j++)  
          { 
            document.write("*"); 
          } 
          document.write("<br>"); 
        } 
      } 
  
      // driver code 
        
      // get the value from user 
      var n = 5; 
        
      // function calling 
      arrow(n); 
</script>

Output :

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

Time Complexity : O(n²) ,where n is the given input number.

Space Complexity : O(1) ,as we are not using any extra space.

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