Programs for printing pyramid patterns using recursion

Last Updated : 24 Jun, 2020

This article is aimed at giving a recursive implementation for pattern printing.

Simple triangle pattern:

C++

// C++ code to demonstrate star pattern 
#include <iostream> 
using namespace std; 
  
// function to print a row 
void printn(int num) 
{ 
    // base case 
    if (num == 0) 
        return; 
    cout << "* "; 
  
    // recursively calling printn() 
    printn(num - 1); 
} 
  
// function to print the pattern 
void pattern(int n, int i) 
{ 
    // base case 
    if (n == 0) 
        return; 
    printn(i); 
    cout << endl; 
  
    // recursively calling pattern() 
    pattern(n - 1, i + 1); 
} 
  
// driver function 
int main() 
{ 
    int n = 5; 
    pattern(n, 1); 
    return 0; 
} 

Java

// Java code to demonstrate star pattern 
import java.io.*; 
  
class GFG  
{ 
      
// function to print a row 
static void printn(int num) 
{ 
    // base case 
    if (num == 0) 
        return; 
    System.out.print ("* "); 
  
    // recursively calling printn() 
    printn(num - 1); 
} 
  
// function to print the pattern 
static void pattern(int n, int i) 
{ 
    // base case 
    if (n == 0) 
        return; 
    printn(i); 
    System.out.println(); 
  
    // recursively calling pattern() 
    pattern(n - 1, i + 1); 
} 
  
// Driver code 
public static void main (String[] args)  
{ 
  
    int n = 5; 
    pattern(n, 1); 
} 
} 
  
// This code is contributed by ajit. 

Python3

# Python3 code to demonstrate star pattern 
  
# function to print a row 
def printn(num): 
      
    # base case 
    if (num == 0): 
        return
    print("*", end = " ") 
  
    # recursively calling printn() 
    printn(num - 1) 
  
# function to print the pattern 
def pattern(n, i): 
      
    # base case 
    if (n == 0): 
        return
    printn(i) 
    print("\n", end = "") 
      
    # recursively calling pattern() 
    pattern(n - 1, i + 1) 
  
# Driver Code 
if __name__ == '__main__': 
    n = 5
    pattern(n, 1) 
  
# This code is contributed by 
# Surendra_Gangwar 

C#

// C# code to demonstrate star pattern 
using System; 
  
class GFG 
{ 
          
// function to print a row 
static void printn(int num) 
{ 
    // base case 
    if (num == 0) 
        return; 
    Console.Write("* "); 
  
    // recursively calling printn() 
    printn(num - 1); 
} 
  
// function to print the pattern 
static void pattern(int n, int i) 
{ 
    // base case 
    if (n == 0) 
        return; 
    printn(i); 
    Console.WriteLine(); 
  
    // recursively calling pattern() 
    pattern(n - 1, i + 1); 
} 
  
// Driver code 
static public void Main () 
{ 
    int n = 5; 
    pattern(n, 1); 
} 
} 
  
// This code is contributed by akt_mit. 

PHP

<?php 
// PHP code to demonstrate star pattern 
  
// Function to print a row 
function printn($num) 
{ 
    // base case 
    if ($num == 0) 
        return; 
    echo "* "; 
  
    // recursively calling printn() 
    printn($num - 1); 
} 
  
// function to print the pattern 
function pattern($n, $i) 
{ 
    // base case 
    if ($n == 0) 
        return; 
    printn($i); 
    echo "\n"; 
  
    // recursively calling pattern() 
    pattern($n - 1, $i + 1); 
} 
  
// Driver Code 
$n = 5; 
pattern($n, 1); 
  
// This code is contributed by @Tushil.. 
?> 

Output:

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

After 180 degree rotation:

C++

// C++ code to demonstrate star pattern 
  
#include <iostream> 
using namespace std; 
  
// function to print spaces 
void print_space(int space) 
{ 
    // base case 
    if (space == 0) 
        return; 
    cout << " "
         << " "; 
  
    // recursively calling print_space() 
    print_space(space - 1); 
} 
  
// function to print asterisks 
void print_asterisk(int asterisk) 
{ 
    // base case 
    if (asterisk == 0) 
        return; 
    cout << "* "; 
  
    // recursively calling print_asterisk() 
    print_asterisk(asterisk - 1); 
} 
  
// function to print the pattern 
void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_space(n - 1); 
    print_asterisk(num - n + 1); 
    cout << endl; 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// driver function 
int main() 
{ 
    int n = 5; 
    pattern(n, n); 
    return 0; 
} 

Java

// Java code to demonstrate star pattern  
import java.util.*; 
  
class GFG 
{ 
  
    // function to print spaces  
    static void print_space(int space) 
    { 
        // base case  
        if (space == 0)  
        { 
            return; 
        } 
        System.out.print(" " + " "); 
  
        // recursively calling print_space()  
        print_space(space - 1); 
    } 
  
    // function to print asterisks  
    static void print_asterisk(int asterisk) 
    { 
        // base case  
        if (asterisk == 0) 
        { 
            return; 
        } 
        System.out.print("* "); 
  
        // recursively calling print_asterisk()  
        print_asterisk(asterisk - 1); 
    } 
  
    // function to print the pattern  
    static void pattern(int n, int num) 
    { 
        // base case  
        if (n == 0) 
        { 
            return; 
        } 
        print_space(n - 1); 
        print_asterisk(num - n + 1); 
        System.out.println(); 
  
        // recursively calling pattern()  
        pattern(n - 1, num); 
    } 
  
    // Driver code  
    public static void main(String[] args)  
    { 
        int n = 5; 
        pattern(n, n); 
    } 
}  
  
// This code is contributed by Rajput-Ji 

Python3

# Python3 code to demonstrate star pattern  
  
# function to prspaces 
def print_space(space): 
      
    # base case 
    if (space == 0): 
        return; 
      
    print(" ", end=" "); 
  
    # recursively calling print_space() 
    print_space(space - 1); 
  
# function to prasterisks 
def print_asterisk(asterisk): 
      
    # base case 
    if (asterisk == 0): 
        return; 
      
    print("*", end =" "); 
  
    # recursively calling print_asterisk() 
    print_asterisk(asterisk - 1); 
  
# function to print the pattern 
def pattern(n, num): 
      
    # base case 
    if (n == 0): 
        return; 
      
    print_space(n - 1); 
    print_asterisk(num - n + 1); 
    print(); 
  
    # recursively calling pattern() 
    pattern(n - 1, num); 
  
# Driver code 
if __name__ == '__main__': 
    n = 5; 
    pattern(n, n); 
      
# This code is contributed by 29AjayKumar 

C#

// C# code to demonstrate star pattern 
using System; 
  
class GFG 
{ 
      
// function to print spaces 
static void print_space(int space) 
{ 
    // base case 
    if (space == 0) 
        return; 
    Console.Write(" " + " "); 
  
    // recursively calling print_space() 
    print_space(space - 1); 
} 
  
// function to print asterisks 
static void print_asterisk(int asterisk) 
{ 
    // base case 
    if (asterisk == 0) 
        return; 
    Console.Write("* "); 
  
    // recursively calling print_asterisk() 
    print_asterisk(asterisk - 1); 
} 
  
// function to print the pattern 
static void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_space(n - 1); 
    print_asterisk(num - n + 1); 
    Console.WriteLine(); 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// Driver code 
public static void Main() 
{ 
    int n = 5; 
    pattern(n, n); 
} 
} 
  
// This code is contributed by Akanksha Rai 

PHP

<?php 
// PHP code to demonstrate star pattern 
// function to print spaces 
function print_space($space) 
{ 
    // base case 
    if ($space == 0) 
        return; 
    echo " ", 
            " "; 
  
    // recursively calling print_space() 
    print_space($space - 1); 
} 
  
// function to print asterisks 
function print_asterisk($asterisk) 
{ 
    // base case 
    if ($asterisk == 0) 
        return; 
    echo "* "; 
  
    // recursively calling print_asterisk() 
    print_asterisk($asterisk - 1); 
} 
  
// function to print the pattern 
function pattern($n, $num) 
{ 
    // base case 
    if ($n == 0) 
        return; 
    print_space($n - 1); 
    print_asterisk(($num - $n) + 1); 
    echo "\n"; 
  
    // recursively calling pattern() 
    pattern($n - 1, $num); 
} 
  
// Driver Code 
$n = 5; 
pattern($n, $n); 
  
// This code is contributed by @Tushil. 
?> 

Output:

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

Printing Pyramid:

C++

// C++ code to demonstrate star pattern 
  
#include <iostream> 
using namespace std; 
  
// function to print spaces 
void print_space(int space) 
{ 
    // base case 
    if (space == 0) 
        return; 
    cout << " "; 
  
    // recursively calling print_space() 
    print_space(space - 1); 
} 
  
// function to print asterisks 
void print_asterisk(int asterisk) 
{ 
    // base case 
    if (asterisk == 0) 
        return; 
    cout << "* "; 
  
    // recursively calling asterisk() 
    print_asterisk(asterisk - 1); 
} 
  
// function to print the pattern 
void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_space(n - 1); 
    print_asterisk(num - n + 1); 
    cout << endl; 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// driver function 
int main() 
{ 
    int n = 5; 
    pattern(n, n); 
    return 0; 
} 

Java

// Java code to demonstrate star pattern 
import java.util.*; 
  
class GFG 
{ 
  
// function to print spaces 
static void print_space(int space) 
{ 
    // base case 
    if (space == 0) 
        return; 
    System.out.print(" "); 
  
    // recursively calling print_space() 
    print_space(space - 1); 
} 
  
// function to print asterisks 
static void print_asterisk(int asterisk) 
{ 
    // base case 
    if (asterisk == 0) 
        return; 
    System.out.print("* "); 
  
    // recursively calling asterisk() 
    print_asterisk(asterisk - 1); 
} 
  
// function to print the pattern 
static void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_space(n - 1); 
    print_asterisk(num - n + 1); 
    System.out.println(""); 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// Driver code 
public static void main(String[] args) 
{ 
    int n = 5; 
    pattern(n, n); 
} 
} 
  
// This code is contributed by 29AjayKumar 

Python3

# Python3 code to demonstrate star pattern 
  
# function to print spaces 
def print_space(space): 
      
    # base case 
    if (space == 0): 
        return; 
    print(" ", end = ""); 
  
    # recursively calling print_space() 
    print_space(space - 1); 
  
# function to print asterisks 
def print_asterisk(asterisk): 
      
    # base case 
    if(asterisk == 0): 
        return; 
    print("* ", end = ""); 
  
    # recursively calling asterisk() 
    print_asterisk(asterisk - 1); 
  
# function to print the pattern 
def pattern(n, num): 
      
    # base case 
    if (n == 0): 
        return; 
    print_space(n - 1); 
    print_asterisk(num - n + 1); 
    print(""); 
  
    # recursively calling pattern() 
    pattern(n - 1, num); 
  
# Driver Code 
n = 5; 
pattern(n, n); 
  
# This code contributed by PrinciRaj1992  

C#

// C# code to demonstrate star pattern 
using System; 
  
class GFG 
{ 
  
// function to print spaces 
static void print_space(int space) 
{ 
    // base case 
    if (space == 0) 
        return; 
    Console.Write(" "); 
  
    // recursively calling print_space() 
    print_space(space - 1); 
} 
  
// function to print asterisks 
static void print_asterisk(int asterisk) 
{ 
    // base case 
    if (asterisk == 0) 
        return; 
    Console.Write("* "); 
  
    // recursively calling asterisk() 
    print_asterisk(asterisk - 1); 
} 
  
// function to print the pattern 
static void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_space(n - 1); 
    print_asterisk(num - n + 1); 
    Console.WriteLine(""); 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// Driver code 
public static void Main(String[] args) 
{ 
    int n = 5; 
    pattern(n, n); 
} 
} 
  
// This code is contributed by 29AjayKumar  

PHP

<?php 
// PHP code to demonstrate star pattern 
  
// function to print spaces 
function print_space($space) 
{ 
    // base case 
    if ($space == 0) 
        return; 
    echo " "; 
  
    // recursively calling print_space() 
    print_space($space - 1); 
} 
  
// function to print asterisks 
function print_asterisk($asterisk) 
{ 
    // base case 
    if ($asterisk == 0) 
        return; 
    echo "* "; 
  
    // recursively calling asterisk() 
    print_asterisk($asterisk - 1); 
} 
  
// function to print the pattern 
function pattern($n, $num) 
{ 
    // base case 
    if ($n == 0) 
        return; 
    print_space($n - 1); 
    print_asterisk($num - $n + 1); 
    echo "\n"; 
  
    // recursively calling pattern() 
    pattern($n - 1, $num); 
} 
  
// Driver code 
    $n = 5; 
    pattern($n, $n); 
      
// This code is contributed by ajit. 
?> 

Output:

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

Number Pattern

C++

// C++ code to demonstrate printing pattern of numbers 
  
#include <iostream> 
using namespace std; 
  
// function to print a row 
void print_row(int no, int val) 
{ 
    // base case 
    if (no == 0) 
        return; 
    cout << val << " "; 
  
    // recursively calling print_row() 
    print_row(no - 1, val); 
} 
  
// function to print the pattern 
void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_row(num - n + 1, num - n + 1); 
    cout << endl; 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
int main() 
{ 
    int n = 5; 
    pattern(n, n); 
} 

Java

// Java code to demonstrate printing  
// pattern of numbers 
class GFG 
{ 
      
// function to print a row 
static void print_row(int no, int val) 
{ 
    // base case 
    if (no == 0) 
        return; 
    System.out.print(val + " "); 
  
    // recursively calling print_row() 
    print_row(no - 1, val); 
} 
  
// function to print the pattern 
static void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_row(num - n + 1, num - n + 1); 
    System.out.println(); 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// Driver Code 
public static void main(String[] args) 
{ 
    int n = 5; 
    pattern(n, n); 
} 
} 
  
// This code is contributed by Code_Mech. 

Python3

# Python3 code to demonstrate printing 
# pattern of numbers 
  
# function to print a row 
def print_row(no, val): 
      
    # base case 
    if (no == 0): 
        return; 
    print(val , end=" "); 
  
    # recursively calling print_row() 
    print_row(no - 1, val); 
  
# function to print the pattern 
def pattern(n, num): 
    # base case 
    if (n == 0): 
        return; 
    print_row(num - n + 1, num - n + 1); 
    print(""); 
  
    # recursively calling pattern() 
    pattern(n - 1, num); 
  
# Driver Code 
n = 5; 
pattern(n, n); 
  
# This code contributed by PrinciRaj1992  

C#

// C# code to demonstrate printing  
// pattern of numbers 
using System; 
  
class GFG 
{ 
      
// function to print a row 
static void print_row(int no, int val) 
{ 
    // base case 
    if (no == 0) 
        return; 
    Console.Write(val + " "); 
  
    // recursively calling print_row() 
    print_row(no - 1, val); 
} 
  
// function to print the pattern 
static void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_row(num - n + 1, num - n + 1); 
    Console.WriteLine(); 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// Driver Code 
public static void Main() 
{ 
    int n = 5; 
    pattern(n, n); 
} 
} 
  
// This code is contributed by Akanksha Rai 

PHP

<?php 
// PHP code to demonstrate printing 
// pattern of numbers 
  
// function to print a row 
function print_row($no, $val) 
{ 
    // base case 
    if ($no == 0) 
        return; 
    echo $val . " "; 
  
    // recursively calling print_row() 
    print_row($no - 1, $val); 
} 
  
// function to print the pattern 
function pattern($n, $num) 
{ 
    // base case 
    if ($n == 0) 
        return; 
    print_row($num - $n + 1,  
              $num - $n + 1); 
    echo "\n"; 
  
    // recursively calling pattern() 
    pattern($n - 1, $num); 
} 
  
// Driver Code 
$n = 5; 
pattern($n, $n); 
  
// This code is contributed 
// by Akanksha Rai 
?> 

Output:

Numbers without re assigning:

C++

// C++ code to demonstrate printing pattern of numbers 
  
#include <iostream> 
using namespace std; 
  
// function to print a row 
int print_row(int ct, int num) 
{ 
    // base case 
    if (num == 0) 
        return ct; 
    cout << ct << "\t"; 
  
    // recursively calling print_row() 
    print_row(ct + 1, num - 1); 
} 
  
// function to print the pattern 
void pattern(int n, int count, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    count = print_row(count, num); 
    cout << endl; 
  
    // recursively calling pattern() 
    pattern(n - 1, count, num + 1); 
} 
  
// driver function 
int main() 
{ 
    int n = 5; 
    pattern(n, 1, 1); 
} 

Java

// Java code to demonstrate  
// printing pattern of numbers 
import java.io.*; 
  
class GFG 
{ 
      
// function to print a row 
static int print_row(int ct, int num) 
{ 
    // base case 
    if (num == 0) 
        return ct; 
            System.out.print(ct + "  "); 
  
    // recursively calling print_row() 
    return print_row(ct + 1, num - 1); 
} 
  
// function to print the pattern 
static void pattern(int n, 
                    int count, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    count = print_row(count, num); 
            System.out.println(); 
  
    // recursively calling pattern() 
    pattern(n - 1, count, num + 1); 
} 
  
// Driver Code 
public static void main (String[] args)  
{ 
    int n = 5; 
    pattern(n, 1, 1); 
} 
} 
  
// This code is contributed by Tushil 

Python3

# Python3 code to demonstrate  
# printing pattern of numbers 
  
# function to pra row 
def print_row(ct, num): 
      
    # base case 
    if (num == 0): 
        return ct; 
    print(ct, end = " "); 
  
    # recursively calling print_row() 
    return print_row(ct + 1, num - 1); 
  
# function to print the pattern 
def pattern(n, count, num): 
      
    # base case 
    if (n == 0): 
        return; 
    count = print_row(count, num); 
    print(); 
  
    # recursively calling pattern() 
    pattern(n - 1, count, num + 1); 
  
# Driver Code 
if __name__ == '__main__': 
    n = 5; 
    pattern(n, 1, 1); 
  
# This code is contributed by 29AjayKumar 

C#

// C# code to demonstrate  
// printing pattern of numbers 
using System; 
  
class GFG 
{ 
  
// function to print a row 
static int print_row(int ct, int num) 
{ 
    // base case 
    if (num == 0) 
        return ct; 
    Console.Write (ct + "  "); 
  
    // recursively calling print_row() 
    return print_row(ct + 1, num - 1); 
} 
  
// function to print the pattern 
static void pattern(int n, 
                    int count, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    count = print_row(count, num); 
    Console.WriteLine(); 
  
    // recursively calling pattern() 
    pattern(n - 1, count, num + 1); 
} 
  
// Driver Code 
static public void Main () 
{ 
    int n = 5; 
    pattern(n, 1, 1); 
} 
} 
  
// This code is contributed by ajit 

Output:

1    
2    3    
4    5    6    
7    8    9    10    
11    12    13    14    15

Character Pattern:

C++

// C++ code to demonstrate printing pattern of alphabets 
  
#include <iostream> 
using namespace std; 
  
// function to print a row 
void print_row(int no, int val) 
{ 
    // base case 
    if (no == 0) 
        return; 
    cout << (char)(val + 64) << " "; 
  
    // recursively calling print_row() 
    print_row(no - 1, val); 
} 
  
// function to print the pattern 
void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_row(num - n + 1, num - n + 1); 
    cout << endl; 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
int main() 
{ 
    int n = 5; 
    pattern(n, n); 
} 

Java

// Java code to demonstrate printing pattern of alphabets 
class GFG 
{ 
  
// function to print a row 
static void print_row(int no, int val) 
{ 
    // base case 
    if (no == 0) 
        return; 
    System.out.print((char)(val + 64) + " "); 
  
    // recursively calling print_row() 
    print_row(no - 1, val); 
} 
  
// function to print the pattern 
static void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_row(num - n + 1, num - n + 1); 
    System.out.println(); 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// Driver code 
public static void main(String[] args) 
{ 
    int n = 5; 
    pattern(n, n); 
} 
} 
  
// This code is contributed by Rajput-Ji 

Python3

# Python3 code to demonstrate printing pattern of alphabets 
  
  
# function to pra row 
def print_row(no, val): 
    # base case 
    if (no == 0): 
        return; 
    print(chr(val + 64), end=" "); 
  
    # recursively calling print_row() 
    print_row(no - 1, val); 
  
  
# function to print the pattern 
def pattern(n, num): 
    # base case 
    if (n == 0): 
        return; 
    print_row(num - n + 1, num - n + 1); 
    print(); 
  
    # recursively calling pattern() 
    pattern(n - 1, num); 
  
  
# Driver code 
if __name__ == '__main__': 
    n = 5; 
    pattern(n, n); 
  
# This code is contributed by 29AjayKumar 

C#

// C# code to demonstrate printing pattern of alphabets 
using System; 
  
class GFG 
{ 
  
// function to print a row 
static void print_row(int no, int val) 
{ 
    // base case 
    if (no == 0) 
        return; 
    Console.Write((char)(val + 64) + " "); 
  
    // recursively calling print_row() 
    print_row(no - 1, val); 
} 
  
// function to print the pattern 
static void pattern(int n, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    print_row(num - n + 1, num - n + 1); 
    Console.WriteLine(); 
  
    // recursively calling pattern() 
    pattern(n - 1, num); 
} 
  
// Driver code 
public static void Main(String[] args) 
{ 
    int n = 5; 
    pattern(n, n); 
} 
} 
  
// This code is contributed by 29AjayKumar 

Output:

A 
B B 
C C C 
D D D D 
E E E E E

Continuous Character pattern:

C++

#include <iostream> 
using namespace std; 
  
// function to print a row 
int print_row(int ct, int num) 
{ 
    // base case 
    if (num == 0) 
        return ct; 
    cout << (char)(ct + 64) << " "; 
  
    // recursively calling print_row() 
    print_row(ct + 1, num - 1); 
} 
  
// function to print the pattern 
void pattern(int n, int count, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    count = print_row(count, num); 
    cout << endl; 
  
    // recursively calling pattern() 
    pattern(n - 1, count, num + 1); 
} 
  
// driver function 
int main() 
{ 
    int n = 5; 
    pattern(n, 1, 1); 
} 

Java

class GFG 
{ 
  
// function to print a row 
static int print_row(int ct, int num) 
{ 
    // base case 
    if (num == 0) 
        return ct; 
    System.out.print((char)(ct + 64) + " "); 
  
    // recursively calling print_row() 
    print_row(ct + 1, num - 1); 
    return num + ct; 
      
} 
  
// function to print the pattern 
static void pattern(int n, int count, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    count = print_row(count, num); 
    System.out.println(); 
  
    // recursively calling pattern() 
    pattern(n - 1, count, num + 1); 
} 
  
// Driver code 
public static void main(String[] args) 
{ 
    int n = 5; 
    pattern(n, 1, 1); 
} 
} 
  
// This code is contributed by 29AjayKumar 

Python3

# function to print row 
def print_row(ct, num): 
      
    # base case 
    if (num == 0): 
        return ct; 
    print(chr(ct + 64), end=" "); 
  
    # recursively calling print_row() 
    print_row(ct + 1, num - 1); 
    return num + ct; 
  
# function to print the pattern 
def pattern(n, count, num): 
  
    # base case 
    if (n == 0): 
        return; 
    count = print_row(count, num); 
    print(); 
  
    # recursively calling pattern() 
    pattern(n - 1, count, num + 1); 
  
# Driver code 
if __name__ == '__main__': 
    n = 5; 
    pattern(n, 1, 1); 
  
# This code is contributed by Rajput-Ji 

C#

using System; 
  
class GFG 
{ 
  
// function to print a row 
static int print_row(int ct, int num) 
{ 
    // base case 
    if (num == 0) 
        return ct; 
    Console.Write((char)(ct + 64) + " "); 
  
    // recursively calling print_row() 
    print_row(ct + 1, num - 1); 
    return num + ct; 
  
} 
  
// function to print the pattern 
static void pattern(int n, int count, int num) 
{ 
    // base case 
    if (n == 0) 
        return; 
    count = print_row(count, num); 
    Console.WriteLine(); 
  
    // recursively calling pattern() 
    pattern(n - 1, count, num + 1); 
} 
  
// Driver code 
public static void Main(String[] args) 
{ 
    int n = 5; 
    pattern(n, 1, 1); 
} 
} 
  
// This code is contributed by 29AjayKumar 

Output:

A 
B C 
D E F 
G H I J 
K L M N O

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