Question

. . . . .
. . . . .
. . r . .
. . . . .   
. . . . .

Grow 1
. . . . .
. . r . .
. r r r .
. . r . .   
. . . . .

Grow 2
. . r . .
. r r r .
r r r r r
. r r r .   
. . r . .

Grow 3
. r r r .
r r r r r
r r r r r
r r r r r   
. r r r .

Grow 4
r r r r r
r r r r r
r r r r r
r r r r r   
r r r r r

Hello, I need help creating a grow function that grows the rose based on the user input. This is in java

Answer 1

CODE:

package rose;

import java.util.Scanner;

public class Rose
{
    //function that grows the rose
    private static void growRose(char[][] arr, int n)
    {
        //initialising the array with dosts
        for(int i=0;i<5;i++)
            for(int j=0;j<5;j++)
                arr[i][j]='.';
        //calculating start and end index, which is basically sucstracting value of (n-1) from 2 and adding 2 for end
        //rose variable stores the number of rose to start with
        int startRowIndex = 2-(n-1),endRowIndex = 2+(n-1),rose = 1;
        //if startIndex after substracting becomes less than 0, then we make it to 0, and change the number of rose
        if(startRowIndex<0)
        {
            rose+=(2*(-startRowIndex)-1);
            startRowIndex = 0;
        }
        //if endIndex becomes greater tahn 4, or goes out of size of array, then assign it to endRowindex
        if(endRowIndex >4)
            endRowIndex = 4;
        //Now we start a for loop from startRowIndex to startColIndex
        for(int i=startRowIndex;i<=endRowIndex;i++)
        {
            //we calculate startColIndex and End column index value by following formula
            int startColIndex = 2-rose/2;
            int endColIndex = 2+rose/2;
            //check if out of bound, then maki it in the bounds
            if(startColIndex<0)
                startColIndex=0;
            if(endColIndex>4)
                endColIndex=4;
            //we run for loop to change the array index to value 'r'
            for(int j=startColIndex;j<=endColIndex;j++)
                arr[i][j]='r';
            //if value of 'i' is less than 2, then we increment the number of rose by 2
            if(i<2)
                rose+=2;
            //else we decrement by 2
            else
                rose-=2;
        }      
    }
    public static void main(String[] args)
    {
        //defining the 2d-array
        char[][] arr = new char[5][5];
        Scanner scan = new Scanner(System.in);
        //taking input from user
        int n = scan.nextInt();
        //calling function to grow the rose according to user input
        growRose(arr,n);
        //prints the 2d array
        for(int i=0;i<5;i++)
        {
            for(int j=0;j<5;j++)
                System.out.print(arr[i][j]);
            System.out.println();
        }
      
    }
  
}

OUTPUT:

3
..r..
.rrr.
rrrrr
.rrr.
..r..

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