I'm a black horse-----swift Basic syntax

Variables and constants:

If you want to define a variable equal to 1, just write var = 1,swift will automatically make type inference.

If you want to define a constant pi equal to 3.14, just write let PI = 3.14, constants can only be assigned once.

Output statement:

You can use the printf function directly to output an arbitrary type of information:

Prinft ("Hello Swift");

String Connection:

If all two variables are strings, you can connect directly with the + sign:

" Hello " var word " Word "  = Hello + Word

If you want to connect the value of the other types of sea oil, then directly using \ () includes the connection can be made:

1 " Hello " 2  - 3 " \ (hello) \ (num) "

Cycle:

Traditional C-language loops:

 for (int i =1;i<; i++) {    //TODO}

In Swift:

1 inch 0.. <{2     //TODO3 }

Condition Judgment:

As with the C language, there is no difference.

In the swift language, the Swith...case statement can be used without the break keyword.

Function:

If you want to define a function to output a piece of information:

func SayHello () {    printf ("Hello Swift");}

Object-oriented:

Definition of the class:

1 class hello{2    func SayHello () {3         printf ("Hello Swift  "); 4     }5 }

The change example defines a class named Hello, in which there is a crown function called SayHello.

Call Function:

1 var h = Hello (); 2 H.sayhello ()

Inheritance of the class:

1 calss hi:hello{2 }

I'm a black horse-----swift Basic syntax