Chapter 1 What is Programing Paradigm 1

Size: px

Start display at page:

Download "Chapter 1 What is Programing Paradigm 1"

鳗席晏
9 years ago
Views:

1 An Introduction to Programing Paradigm Chase Zhang May 8, 2013

2 Chapter 1 What is Programing Paradigm 1

3 CHAPTER 1. WHAT IS PROGRAMING PARADIGM 2 Definition from Wikipedia 1. Object-oriented programming/ 2. Functional programing / 3. Meta programing/

4 CHAPTER 1. WHAT IS PROGRAMING PARADIGM 3 Python Ruby, JavaScript C Java

5 Chapter 2 4

6 CHAPTER SmallTalk 2. C++ 3. Java 4. Python 5. Ruby 6. JavaScript 7. Objective-C 8. C#

7 CHAPTER // A C lang s way to do this 2 typedef struct _member { 3 char* name; 4 int sex; 5 int student_id; 6 int class_id; 7 int school_id; 8 int grade; 9 }member; // define the functions to generate and destroy structs 12 member* create_member(); 13 void delete_member(member* m);

8 CHAPTER member* m = create_member(); 2 3 // It s not good to allow accessing to properties directly 4 m->sex = ; 5 m->grade = 3000; 6 7 // You should uses setter functions 8 void set_member_name(member* m,char* name); 9 void set_member_sex(member* m,int name); 10 void set_member_student_id(member* m,int name); 11 void set_member_class_id(member* m,int name); 12 void set_member_grade(member* m,int name);

= 12431234; 5 m->grade = 3000; 6 7 // You should uses setter functions 8 void set_member_name(member*

9 CHAPTER //redefine struct 2 3 typedef struct _member { 4 char* name; 5 int sex; 6 int student_id; 7 }member; 8 9 //define getter functions char* get_member_name(member* m); 12 int get_member_sex(member* m); 13 int get_member_student_id(member* m); 14 int get_member_class_id(member* m); 15 int get_member_grade(member* m);

student_id; 7 }member; 8 9 //define getter functions 10 11 char*

10 CHAPTER 2. 9 C set_member_xxx get_member_xxx 3. set_xxx get_xxx 4. member Let's solve these problems!

11 CHAPTER See Ruby s Way 1 class Member 2 def initialize(name,student_id) 3 # Hello everyone, I am the initializer = name = student_id = sex 7 end 8 9 def name=(name) 10 # do something here to make sure a valid name is given = name 12 end 13

Hello everyone, I am the initializer 4 @name = name 5 @student_id =

12 CHAPTER def name # you do not need a reference to the instance here 16 end 17 end # generate a new member, the initialize function will be called automatically 20 a_member = Member.new("Chase Zhang","0709xxxx","boy") 21 a_member.name = "Hello" 22 puts a_member.name

here 16 end 17 end 18 19 # generate a new member, the initialize

13 CHAPTER Why this way?

14 CHAPTER class Member 2 # magics here!add only one line, you get 3 pairs of setters and getters 3 # it s the magic of metaprograming that we ll talk about later 4 attr_accessor :student_id,:name,:sex 5 def initialize(name,student_id,sex) = name # this is a property = student_id = sex 9 end 10 end 11 a_member = Member.new("Chase Zhang","0709xxxx","boy") 12 a_member.student_id = " " 13 puts a_member.student_id # print a_member.student_id

later 4 attr_accessor :student_id,:name,:sex 5 def initialize(name,student_id,sex) 6 @name = name # this is a property 7

15 CHAPTER / 1. / 2.

16 CHAPTER # all instances of the same class shared the functions 2 # but every instance of class is seperated 3 # the interperetor knows whose perperties to use 4 # and returns the correct value 5 6 a = Member.new("Chase Zhang","xxxxxxx","boy") 7 b = Member.new("Sean Lee","xxxxxxxx","boy") 8 9 puts a.name 10 # Chase Zhang puts b.name 13 # Sean Lee

class is seperated 3 # the interperetor knows whose perperties to use 4 # and returns the

17 CHAPTER Ruby Python C++ / new

18 CHAPTER class Vec2 2 attr_accessor :x,:y 3 def initialize(x,y) 6 end 7 def +(v2) 8 x + v2.x 9 y + v2.y 10 Vec2.new(x,y) 11 end 12 end 13 v1 = Vec2.new(1,3) 14 v2 = Vec2.new(2,5) 15 v1+v2 # we get Vec2(3,8)

4 @x=x 5 @y=y 6 end 7 def +(v2) 8 x = @x + v2.

19 CHAPTER 2. 18

20 Chapter 3 Magics Magic 19

21 CHAPTER 3. MAGICS 20 1 int sort_member(const void* member1,const void* member2) 2 { 3 member* m1 = (member*) member1; 4 member* m2 = (member*) member2; 5 return strcmp(m1->name,m2->name); 6 } 7 int main(void) 8 { 9 // qsort(member_list, 11 sizeof(member_list)/sizeof(member*), 12 sort_member); 13 return 0;}

22 CHAPTER 3. MAGICS 21 1 # ruby 2 3 member_list.sort do x,y 4 x.name <=> y.name 5 end 6 # that s all

23 CHAPTER 3. MAGICS 22 C 1 void print_member_if_sex(member* m,int sex) 2 { 3 if(sex==0){ 4 printf("%s\n",m->name); 5 } 6 } 7 8 int main(int argc, const char *argv[]) 9 { 10 // int i; 12 int sex = 0; // Zero stands for boy

24 CHAPTER 3. MAGICS for (i = 0; i < sizeof(member_list)/sizeof(member*); i++) { 14 print_member_if_sex(member_list[i],sex); 15 // You must past the varible sex into the function 16 } 17 return 0; 18 }

25 CHAPTER 3. MAGICS 24 1 sex_wanted = "boy" 2 3 member_list.each do member 4 if member.sex == sex_wanted 5 puts member.name 6 end 7 end 8 # that s all

26 Chapter 4 Meta 25

27 CHAPTER 4. META 26

28 CHAPTER 4. META 27 1 class Member 2 attr_accessor :student_id,:name,:sex # magic >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 6 7 def self.field(sym,range) 8 # a program to program 9 define_method sym do 11 end 12 end # magic <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< 15

29 CHAPTER 4. META def initialize(name,student_id,sex) = name = student_id = sex 20 # magic > 21 Member.field :school_id, Member.field :grade, # magic < 24 end 25 end c = Member.new "Chase Zhang","0709xxxx","boy" puts c.school_id # puts c.grade # 09

30 CHAPTER 4. META 29 1 # before magic 2 puts 1+1 # # magic >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 5 class Fixnum 6 alias :old_plus :+ # new name for plus operator 7 8 def +(value) end 11 end 12 # magic <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

31 CHAPTER 4. META # after magic 15 puts 1+1 # 0

32 Chapter 5 Thank you and... 31

33 CHAPTER 5. THANK YOU AND Ruby 2. Dive into Python 3. Ruby Some Books Some websites JavaScript/CoffeeScript 2. Lisp Some Languages

FY.DOC

FY.DOC 高职高专 21 世纪规划教材 C++ 程序设计邓振杰主编贾振华孟庆敏副主编人民邮电出版社内容提要本书系统地介绍 C++ 语言的基本概念基本语法和编程方法, 深入浅出地讲述 C++ 语言面向对象的重要特征 : 类和对象抽象封装继承等主