[shoopik]

ng-value="{{formula.join('')}}"

неа, в поле то писать могу, но калькулятор не работает:

<div class="container" ng-controller="calcCtrl">
	<div class="content">
	
	<br>
	<input type="text" ng-value="{{formula.join('')}}">
	
    <button class="btn_calc" ng-click='add(7)'>7</button>
    <button class="btn_calc"  ng-click='add(8)'>8</button>
    <button class="btn_calc" ng-click='add(9)'>9</button>
    <button class="btn_calc" ng-click='add("/")'>/</button>
    <br>
    <button class="btn_calc" ng-click='add(4)'>4</button>
    <button class="btn_calc" ng-click='add(5)'>5</button>
    <button class="btn_calc" ng-click='add(6)'>6</button>
    <button class="btn_calc" ng-click='add("*")'>*</button>
    <br>
    <button class="btn_calc" ng-click='add(1)'>1</button></td>
    <button class="btn_calc" ng-click='add(2)'>2</button></td>
    <button class="btn_calc" ng-click='add(3)'>3</button></td>
    <button class="btn_calc" ng-click='add("-")'>-</button></td>
    <br>
    <button class="btn_calc" ng-click='add(0)'>0</button>
    <button class="btn_calc" ng-click='add(".")'>.</button>
    <button class="btn_calc" ng-click='add("+")'>+</button>
    <button class="btn_calc" ng-click="eval()">=</button>
    <br>
    <button class="btn_clear" ng-click="remove()">CLEAR</button>
    
	</div>
</div>

app.controller('calcCtrl',  function($scope) {
    $scope.formula = ['0'];
	$scope.add = function(item) {
    if ($scope.formula == '0') $scope.formula = [item];
    else $scope.formula.push(item);
};
    $scope.remove = function() {
    $scope.formula.pop();
    if($scope.formula.length == 0) $scope.formula = ['0'];
};
    $scope.eval = function() {
    var result = eval($scope.formula.join(''));
    $scope.formula = [result];
};
 	
    });