Java simple method error

Why does this cause an error?

I'm getting "Incompatible operand types int[] and int" on line 6

public static int whichShip(int[][] array, int row, int col){
	 //find which ship got hit (find coordinate in compBoard array, and return the index)
		int i = 0;
		for (i = 0; i < array.length; i++){
		 for (int j = 0; j < array[i].length; j++){
			 if (array[i] == row && array[i][j] == col){
				 return i;
			 		}
			 }
		}
	}

Open in new window

LVL 25
Kyle HamiltonData ScientistAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

for_yanCommented:
array[i] is one-dimensional array
beaciues array is two dimensional array

Open in new window

0
for_yanCommented:
you provbable meant somethimng like that - cpomparing int's

 if (i == row && j == col)
0
for_yanCommented:
I guesss this is how it should be
public static int whichShip(int[][] array, int row, int col){
	 //find which ship got hit (find coordinate in compBoard array, and return the index)
		int i = 0;
		for (i = 0; i < array.length; i++){
		 for (int j = 0; j < array[i].length; j++){
			 if (i== row && j == col){
				 return arry[i][j];
			 		}
			 }
		}
	}
                                  

Open in new window

0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

for_yanCommented:
still does not make much sense , why jsust not to return

array[row][col]  ?
0
for_yanCommented:
one thing is clear - you cannot write this:
array[i] == row

Open in new window

beacuse array[i] is one-dimensional int array int[]

Open in new window


and row is just int

so no comparison beteenn them can be made - this is a compiler error - rethink what you wanted to express
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Kyle HamiltonData ScientistAuthor Commented:
I'm just staring to learn Java, so please pardon my ignorance...

I want to find the row where my coordinates (row, col) reside...

I changed my code to this, which is no longer causing an error (though I'm not sure that this is what I'm getting at yet...)

public static int whichShip(int[][] array, int row, int col){
	 //find which ship got hit (find coordinate in compBoard array, and return the index)
		int result = 0;
		for (int i = 0; i < array.length; i++){
			for (int j = 0; j < array[i].length; j++){
				if (i == row && array[i][j] == col){
					result = i;
				}
			 }
		}
		return result;
	}

Open in new window

0
for_yanCommented:
>I want to find the row where my coordinates (row, col) reside...

Sorry I am not sure I undersatnd

you have two-dimensional array of int
this array for any two coordinates - row and column will return one value - which sits in the cell with this row and this column so for row = 2 and col = 1 it can return one value
which will be the value stored ion the element array[2][1] -and that may be any int value stored in that element
to solve this task you don't need to go through array just arry[row][col] wioll give you the result.

if you wnat to resolve the opposite question, Say I have int value 12 - which cell of my grid represented by array[row][col] is this value sitting?
is this waht you want?
0
for_yanCommented:
if you want the answer to the last question - then you cannot have method which returns one int value which could give answer to that last question.
because the answer for this question contains not one int number , but two int numbers - you need to return from this method both row and col
0
for_yanCommented:
in order to return the coordinates of the array element which has a specified value you need to define a new class , say class Coordinates which will have two fields - int row and int col and you can have a method which will return the instance of such class

for example

class Coordinates {
int row;
int col;
public Coordinates(int row, int col){
this.row = row;
this.col = col;
}

public int getRow() { return row; }

public int getColumn() { return col; }


}


once you define such method which will return instance of class Cooordinates
corresponding to the location in our array where the value has certain number
for example let's find coordinates of the eleemt whose value is 12:

then you may have something like below:

int value = 12;
Coordinates coords = getCoords(array, value);
System.out.println(coords.getRow() + " ," + coords.getColumn());

public Coordinates getCoords(int [][] array, int value){

for(int j=0;j<array.length; j++){
for(int i=0; i<array[j].length; i++){
if(array[j][i] == value){
Coordinates coords = new Coordinates(j, i);
return coords;

}

}
}
return null;
}







}

Open in new window

0
for_yanCommented:
This is a reall example how this would compile and work
(see output below)

public class Miscellaneous {

    static int[][] array = new int[][]{{1,2,3},{4,5,6} };


    public static  Coordinates getCoords(int [][] array, int value){

for(int j=0;j<array.length; j++){
for(int i=0; i<array[j].length; i++){
if(array[j][i] == value){
Coordinates coords = new Coordinates(j, i);
return coords;

}

}
}
return null;
}

    public static void main(String[] args) {

     int value = 6;
Coordinates coords = getCoords(array, value);
System.out.println(coords.getRow() + " , " + coords.getColumn());


    }
}

class Coordinates {
int row;
int col;
public Coordinates(int row, int col){
this.row = row;
this.col = col;
}

public int getRow() { return row; }

public int getColumn() { return col; }


}

Open in new window


Output:
1 , 2

Open in new window


indeed in the array we initialized in the beginning of the class
array[1][2] = 6
0
Kyle HamiltonData ScientistAuthor Commented:
Hi for_yan,

I completely screwed up what I was trying to achieve. And hence, it made no sense :)

I have since figured it out, but it's totally dependent on other stuff in the program and the method I wrote in the end has little to do with my original code:

public static int whichShip(int[][] array, int row, int col){
	 //find which ship got hit (find coordinate in compBoard array, and return the index)
		int result = 0;
		for (int i = 0; i < array.length; i++){
			for (int j = 0; j < array[i].length; j++){
				
				if(array[i][j] == (row * 10) + col){
					result = i;
					break;
				}
				
			 }
		}
		return result;
	}

Open in new window


I want to give you credit for steering me away from what I was doing... thus I will accept one of your answers even though I didn't actually use it.

Thank you so much.....
0
Kyle HamiltonData ScientistAuthor Commented:
Thank you so much... I need all the help I can get!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
CSS

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.