var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope) {
  $scope.name = 'World';
});
<!DOCTYPE html>
<html ng-app>

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <link rel="stylesheet" href="style.css" />
    <script data-require="angular.js@1.0.x" 
    src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js" data-semver="1.0.7"></script>
    <script>
    var MainCtrl = function($scope){
      $scope.name = "Senthil Sivasubramanian";
      $scope.islength = false;
      $scope.$watch('name',function(){
        $scope.islength = ($scope.name.length > 0);
      });
    };
    </script>
  </head>
  <body ng-controller="MainCtrl">
    <p>Hello {{name}}!</p>
    <p ng-show=islength>shows</p>
  </body>
</html>
/* Put your css in here */