Lakes.java

import java.util.Scanner;

public class Lakes {

	public static void main (String [] args){
		
		Scanner input = new Scanner (System.in);
		System.out.println("What is the structure of the lake ? Use 'd' for down , 'u' for up, and 'h' for horizontal");
		String lake = input.nextLine();
		String [] lakeArray = lake.split("");
		double down = 0.5;
		double squareDown = 0;
		double horizontal = 1;
		double squareHorizontal = 0;
		double squareUp = 0;
		double square = 0;
		for (int i=0; i<lakeArray.length; i++){
			if (lakeArray[i].equals("d")){
				squareDown += down;
				down++;
							}
			if (lakeArray[i].equals("h")){
				squareHorizontal += horizontal*(down-0.5);
				
			}
			if (lakeArray[i].equals("u")){
				down--;
				squareUp += down;
			}
		}
		 
		 if (squareUp==squareDown){
			 square = (squareDown + squareUp+squareHorizontal)*1000;
			 int squareLake = (int) square;
			 System.out.println("The square of the lake is - " +squareLake); 
		 }
		 else {
			System.out.println("The depth must always start from 0 and finish at depth 0 ('d' and 'u' must be equal)!"); 
		 }
	
		
	}
}