// <script src="battleship.js"></script>

var location1 = 3;
var location2 = 4;
var location3 = 5;

var guess;
var hits = 0;
var guesses = 0;

var isSunk = false;

while (isSunk == false) {
	guess = prompt("Ready, aim, fire! (enter a number 0-6):");
	if ( guess < 0 || guess > 6 ) {
		alert("Please enter a valid number!");
}
	else {
		guesses = guesses + 1;

		if (guess == location1 || guess == location2 || guess = location3) {
			hits = hits + 1;
			alert("HIT!");
				else {
					alert("MISS!");
				}
			if (hits == 3) {
				isSunk = true;
				alert("You sank my battleship!");
			}
		}
	}
}
var stats = "You took " + guesses + " guesses to sink the battleship, " + "which means your shooting accuracy was " + (3/guesses);
alert(stats);