input = [];
i = 0;
display = "";

$(".screen").html("0");

$(".button").on('click', function() {
	var value = $(this).attr("id");
	display = "";
	if (value == "C") {
		input.pop();
		console.log(input);
		i = i - 1;
		}
	else {
		input.push(value);
		console.log(input);
		i = i + 1;
		};
	for (var k = 0 ; k < input.length ; ++k) {
		display = display + input[k];
		}
	if (display === "") {
		$(".screen").html("0");
		}
	else {
		$(".screen").html(display);
		}
	}
);


$(".equal-button").on('click', function() {
	output = "";
	if (input[0] === "=") {
		output = 0
		}
	else {
		for (var j = 0 ; j < input.length - 1 ; ++j) {
			output = output+input[j];
			}
		}
	console.log(eval(output));
	$(".screen").html(eval(output));
	input = [];
	display = "";
	i = 0;
	}
);

$("#CE").on('click', function() {
	input = [];
	display = "";
	i = 0;
	$(".screen").html("0");
	}
);