constant.js

app.constant('PI',3.1416);

app.config(function($provide){
	$provide.provider('otherService',function(PI){
  	this.$get = function(){
    	var factory = {};
      
      factory.add = function(a,b){
      	return a + b;
      }
      
      factory.PI = PI;
      
      return factory;
    }
  })