variable

 void main()

{
  /*var a = 20;
  print(a);
  print(a.runtimeType);*/ /// To indicate the type

  /*var b = "Rahul";
  print(b.runtimeType);*/

  /*var c = true;
  print(c.runtimeType);*/

//Here,same data_type variable value can be changed using "var" keyword while declaring variable.so whenever we declare
//variable using "var" keyword and when we give particular value to that variable after that we can't change the dataType
// of that variable directly.whenever we declare a variable using "var" keyword and when we don't initialize the value to
//that variable then that variable will treat as Dynamic
  /*var d = true;
  print(d);
  d = false;
  print(d);*/


  /// Dynamic Variable
  /*var t;        //Dynamic variable
  t = 10;       //Assigning integer value
  print(t);
  print(t.runtimeType);
  print("t ${t.runtimeType}");

  t = "Hello";  //Assigning String value
  print(t);
  print(t.runtimeType);
  print("t ${t.runtimeType}");

  t = true;     //Assigning boolean value
  print(t);
  print(t.runtimeType);
  print("t ${t.runtimeType}");*/

  /// Dynamic Variable
  // dynamic x = 10;
  // print("x -> ${x.runtimeType}");
  // x = 5.5;
  // print("x -> ${x.runtimeType}");
  // x = "Hello World";
  // print("x -> ${x.runtimeType}");
  // x = true;
  // print("x -> ${x.runtimeType}");

  String firstname = "Can";
  String surname = "van Gool";
  print(firstname);
  print(surname);
  String fullname = firstname + " " + surname;
  print(fullname);
  String fullname2 = "Firstname: $firstname $surname";
  print(fullname2);

}