IrregularArray.java

//Program to read and print an array of size n rows with variable column size.

import java.util.Scanner;
class IrregularArray
{
	public static void main(String[] args)
	 {
	 	System.out.print("\nEnter the number of rows: ");
		  Scanner reader = new Scanner(System.in);
		  int r = reader.nextInt();

		 // Declaring 2-D array with r rows
		 int arr[][] = new int[r][];
	
		 // Creating a 2D array such that first row
		 // has 1 element, second row has two
		 // elements and so on.
		int col [] = new int[r];
		 for (int i = 0; i < arr.length; i++)
		 {  
		     System.out.print("\nEnter the number of elements in row "+ (i+1 ));
		     col[i] = reader.nextInt();
		     arr[i] = new int[col[i]];
		 }
		 // Initializing array
		 int count = 0;
		 for (int i = 0; i < arr.length; i++)
		 for (int j = 0; j < arr[i].length; j++)
		 arr[i][j] = count++;

		 // Displaying the values of 2D Jagged array
		 System.out.println("Contents of 2D Jagged Array");
		 for (int i = 0; i < arr.length; i++) 
		{
			 for (int j = 0; j < arr[i].length; j++)
			 System.out.print(arr[i][j] + " ");
			 System.out.println();
	 	}
 	}
}