OC Language (OBJECTIVE-C) first article

First, OC Introduction

1.OC is an object-oriented programming, the main decomposition of the problem composed of objects, coordinate the object to contact and communication to solve the problem.

2.C language is a process-oriented idea, which analyzes the steps to solve the problem, realizes the function, and calls the function.

3.objective-c is one of the core of Apple OS X and IOS OS.

Note: You should be aware of the C language or similar programming language before learning OC, and you should understand its rationale for any programming language.

II. Classes and objects

1. What is a class?

Class: Has the same characteristic attribute, divides into: class name, attribute and method.

2. What is an object?

Objects: Features with classes

3. Class and Object relationships?

Classes and objects are the core of an object-oriented object, which is an instance of the class that is the type of the object.

Third, OC Learning

1. Make detailed comments on each step:

A. Main function:

B. declaration

C. Implementation

D. Printing results

Iv. Mastery of content:

What is a class? What is an object? How do I create an object? How do you declare and implement a method and invoke it?

OC Language (OBJECTIVE-C) first article