Java Program to Print Right Pascal and Left Pascal Triangle Face to Face (Butterfly) Star Pattern

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Program to Print Butterfly Star Pattern

In this article we are going to see how to print the Reverse k-shape star program.

Example-1

When row value=4
*         *
**      **
***   ***
********
***   ***
**      **
*         *
Example-2:

When row value=5
*            *
**         **
***      ***
****   ****
**********
****   ****
***      ***
**         **
*           *

Now, let’s see program to  how print it.

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Approach:

  • Enter total row and store it in an integer variable row.
  • Take first outer for loop to print all rows of upper part .
    • First inner for loop will print all stars of the column of the left pascal.
    • Second inner loop will print the space of all column value .
    • Third  inner for loop to print all stars of the column values of right pascal .
  • Take first outer for loop to print all rows of lower part .
    • First inner for loop will print all stars of the column of the left pascal.
    • Second inner loop will print the space of all column value .
    • Third  inner for loop to print all stars of the column values of right pascal .

JAVA Code:

Method-1 : Static Star Character

import java.util.*;
public class Main 
{    
    public static void main(String args[])   
    {   
        // taking variable for loop iteration and row .
        int row,r,c,d;
        //creating object 
        Scanner s = new Scanner(System.in);
        // entering the number of row
        System.out.print("Enter rows : ");
        row = s.nextInt();
        //printing row value (upper part )
         for (r=1; r<=row ; r++)
        {
            for (c = 1; c <= r; c++)
                 System.out.print("*");
            for (c= r*2; c <= row*2-1; c++)
                System.out.print(" ");
            for (c = 1; c <= r; c++)
                System.out.print("*");
            System.out.println();
        }
        //printing row value (lower part )
        for (r=1; r<=row -1; r++)
        {
            for (c = row -1; c >= r; c--)
                System.out.print("*");
            for (c= 1; c <= r*2; c++)
                System.out.print(" ");
            for (c = row -1; c >= r; c--)
                System.out.print("*");
            System.out.println();
        }
    }
}

Output:

Enter Rows :5
*            *
**         **
***      ***
****   ****
**********
****   ****
***      ***
**         **
*            *

Method-2 : User Input Character

import java.util.*;
public class Main 
{    
    public static void main(String args[])   
    {   
        // taking variable for loop iteration and row .
        int row,r,c,d;
        char k;
        //creating object 
        Scanner s = new Scanner(System.in);
        // entering the number of row
        System.out.print("Enter rows : ");
        row = s.nextInt();
        // entering any random character
        System.out.print("Enter character : ");
        k = s.next().charAt(0);
        //printing row value (upper part )
         for (r=1; r<=row ; r++)
        {
            for (c = 1; c <= r; c++)
                 System.out.print(k);
            for (c= r*2; c <= row*2-1; c++)
                System.out.print(" ");
            for (c = 1; c <= r; c++)
                System.out.print(k);
            System.out.println();
        }
        //printing row value (lower part )
        for (r=1; r<=row -1; r++)
        {
            for (c = row -1; c >= r; c--)
                System.out.print(k);
            for (c= 1; c <= r*2; c++)
                System.out.print(" ");
            for (c = row -1; c >= r; c--)
                System.out.print(k);
            System.out.println();
        }
    }
}

Output:

Enter Rows :5
Enter character : 0
0                0
00            00
000        000
0000    0000
0000000000
0000    0000
000       000
00           00
0               0

C Code:

#include <stdio.h>
int main() {
   int r, row, c ,d;
   printf("Enter rows: ");
   scanf("%d", &row);
          for (r=1; r<=row ; r++)
        {
            for (c = 1; c <= r; c++)
                 printf("*");
            for (c= r*2; c <= row*2-1; c++)
                 printf(" ");
            for (c = 1; c <= r; c++)
                 printf("*");
            printf("\n");
        }
        //printing row value (lower part )
        for (r=1; r<=row -1; r++)
        {
            for (c = row -1; c >= r; c--)
               printf("*");
            for (c= 1; c <= r*2; c++)
                 printf(" ");
            for (c = row -1; c >= r; c--)
                 printf("*");
             printf("\n");
        }
   return 0;
}

Output:

Enter Rows :5
*            *
**         **
***      ***
****   ****
**********
****   ****
***      ***
**         **
*            *

C++ Code:

#include <iostream>
using namespace std;
int main()
{
   int row, r , c ,d ;
   cout << "Enter  rows: ";
   cin >> row;
    for (r=1; r<=row ; r++)
        {
            for (c = 1; c <= r; c++)
                 cout << "*";
            for (c= r*2; c <= row*2-1; c++)
                 cout <<" ";
            for (c = 1; c <= r; c++)
                cout <<"*";
            cout <<"\n";
        }
        //printing row value (lower part )
        for (r=1; r<=row -1; r++)
        {
            for (c = row -1; c >= r; c--)
             cout <<"*";
            for (c= 1; c <= r*2; c++)
                cout <<" ";
            for (c = row -1; c >= r; c--)
                cout <<"*";
             cout <<"\n";
        }
    return 0;
    
}



Output:

Enter Rows :5
*            *
**         **
***      ***
****   ****
**********
****   ****
***      ***
**         **
*            *

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