Edit in JSFiddle

<div data-ng-app="ngApp" data-ng-controller="ngCtrl">
  <p>İsim: <input type="text" data-ng-model="isim" /></p>
  <p>Soyad: <input type="text" data-ng-model="soyad" /></p>
  <p>{{ isim + ' ' + soyad }}</p>
</div>

  var app = angular.module("ngApp", []);

  app.controller("ngCtrl", function($scope) {
    $scope.isim = "Mehmet";
    $scope.soyad = "Yılmaz";
  });