javascript - Angularjs - Cross Controller Calculation -

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i trying create application angularjs, it's large application needs broken down multiple controllers. need calculate across controllers. 

angular.module('cross.controller.demo',[]);    angular.module('cross.controller.demo').controller('kidsctrl', function ($scope) {     $scope.kids = [      {"name":"john", "expense":"1000"},       {"name":"anna", "expense":"900"}];  });    angular.module('cross.controller.demo').controller('housectrl', function ($scope) {     $scope.house =  {"category":"utilities", "expense":"2000"};  });    angular.module('cross.controller.demo').controller('resultctrl', function ($scope) {     $scope.result =  {"category":"total", "expense":"2000"};  });
<!doctype html>  <html ng-app="cross.controller.demo">  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>  <script src="script.js"></script>  <body>    <div ng-controller="kidsctrl">      <div ng-repeat="kid in kids">      {{kid.name}}      <input type="text" ng-model="kid.expense">    </div>    </div>        <div ng-controller="housectrl">      {{house.category}}      <input type="text" ng-model="house.expense">    </div>        <div ng-controller="resultctrl">      {{result.category}}      <input type="text" ng-model="result.expense">    </div>  </body>  </html>

please find plunk here.

i want add both expenses kids , expense house result controller's "result.expense"

put service , call out service everything.

edit: see updated plnk. said, need notify controllers when these change in service. see answer here on using observer pattern service in angular.

angular.module('cross.controller.demo',[]);  angular.module('cross.controller.demo').factory('sharedfactory', function() {      var kids = [        {"name":"john", "expense":"1000"},         {"name":"anna", "expense":"900"}];       var house = {"category":"utilities", "expense":"2000"};       var gethouse = function() {        return house;      }       var getkids = function() {        return kids;      }       var gettotalexpenses = function() {         var expenses = parseint(house.expense);         kids.foreach(function(kid) {           expenses += parseint(kid.expense);         });          return {           category: "total",           expense: expenses         }      }       return {        gethouse: gethouse,        getkids: getkids,        gettotalexpenses: gettotalexpenses      } });  angular.module('cross.controller.demo').controller('kidsctrl', function ($scope, sharedfactory) {    $scope.kids = sharedfactory.getkids(); });  angular.module('cross.controller.demo').controller('housectrl', function ($scope, sharedfactory) {    $scope.house = sharedfactory.gethouse(); });  angular.module('cross.controller.demo').controller('resultctrl', function ($scope, sharedfactory) {    $scope.result = sharedfactory.gettotalexpenses(); });

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