ccbsd3 :cpp % cat -n mannew.h
     1 //mannew.h -- by tsaiwn@csie.nctu.edu.tw
     2 //設計兩個 class: Animal 和 從 Animal 擴充來的 mankind
     3 //Interface file for "mankind" and "Animal" classes
     4 class Animal {
     5         int pv1;
     6         float pv2;
     7     protected:
     8         int pt1[5];
     9     public:
    10         Animal(int = 38);   // default parameter, 若沒寫則compiler自動填38
    11         float pb1;
    12         int pb2[9];
    13         void talk(void);
    14 };
    15 ///
    16 class mankind:public Animal{    // mankind 最好第一字要大寫!
    17         char * pv3;
    18     public:        
    19         mankind(char * ="NoName");   // Constructor
    20         ~mankind( );    // Destructor
    21         int pb3[8];
    22         void talk(void);
    23 };
ccbsd3 :cpp % cat -n manlib.cpp
     1 //manlib.cpp -- Implementation file for "Animal" and "mankind"
     2 // 實作 Animal 和 mankind 這兩個 class
     3 // -- by tsaiwn@csie.nctu.edu.tw
     4 #include <stdio.h>
     5 #include <iostream>
     6 using namespace std;
     7 #include "mannew.h"
     8  Animal::Animal(int x){
     9 	pv1=x;
    10 	pv2=45.67;
    11 	this->pb1=135.246;
    12 	for (int i=0; i<9; i++) pb2[i]=i+1;
    13 	//pb2={ 1,2,3,4,5,6,7 ,8,9};
    14   cout<<" Animal shows up\n";
    15 };
    16 void Animal::talk(void)
    17 {
    18  cout << " Animal talk, pv1=" << dec <<pv1 <<"=0x" << hex << pv1 <<"\n";
    19  cout << " \t pv2=" << pv2 <<"\n";
    20  cout << " \t pb1=" << pb1 <<"\n";
    21  cout << " \t pb2[6]=" << pb2[6] <<"\n";
    22 };
    23 mankind::mankind(char * name){
    24 	pv3=name;
    25 	cout << " mankind "<< pv3 << " appears\n";
    26 }
    27 mankind::~mankind(void){
    28 	cout << " %%% mankind "<< this->pv3 << " is dying \n";
    29 }
    30 void mankind::talk(void)
    31 {
    32   // cout << " mankind talk, pv1=" << pv1 <<"\n";
    33   // cout << " mankind talk, pb2=" << pb2 <<"\n";
    34   // cout << " mankind talk, pb2=" << Animal::pb2 <<"\n";
    35   cout << " mankind talk, pb2[0]=" << pb2[0] <<"\n";
    36  cout << " mankind talk, pv3=" << pv3 <<"\n";
    37  cout << " mankind talk, pb3[3]=" << pb3[3] <<"\n";
    38 };
ccbsd3 :cpp % g++ -c manlib.cpp
ccbsd3 :cpp % ar r libanim.a manlib.o
 ar: creating libanim.a

               ( -c 是說 compile only, 此會生出 manlib.o)
         (如果你願意, 可將之做成 library, 則 manlib.cpp 就不用給人家
           見下一頁最後; 給 manlib.o 也可以不用給 manlib.cpp; 但 .h 檔要給)


ccbsd3 :cpp % cat -n mannew.cpp
     1 //mannew.cpp --test Animal, mankind;  by tsaiwn@csie.nctu.edu.tw
     2 // g++ mannew.cpp manlib.cpp; ./a.out
     3 #include <stdio.h>
     4 #include <iostream>
     5 using namespace std;
     6 #define call
     7 #include "mannew.h"
     8 ///
     9 Animal aa1(123),aa2(456);
    10 mankind * mm1, *mm2;
    11 void onlyasub(void)
    12 { mankind nobody;
    13   cout << " Now in routine onlyasub\n";
    14 }
    15 main(){
    16   aa1.talk();
    17   cout << "Welcome to C++\n";
    18   call onlyasub();
    19   mm1= new mankind("Chang-3");
    20   mm2= new mankind("Lee-4");
    21   cout << "mm1->pb1=" << mm1->pb1 << "\n";
    22   cout << " (Let mm1 talk)\n";
    23   mm1->talk();
    24   delete mm2;
    25   cout << " (and then Let mm1 talk by Animal method)\n";
    26   mm1->Animal::talk();
    27   return(0);
    28 }
ccbsd3 :cpp % g++ mannew.cpp manlib.cpp
ccbsd3 :cpp % g++ mannew.cpp manlib.o
ccbsd3 :cpp % ./a.out | cat -n
     1   Animal shows up
     2   Animal shows up
     3   Animal talk, pv1=123=0x7b
     4   	 pv2=45.67
     5   	 pb1=135.246
     6   	 pb2[6]=7
     7  Welcome to C++
     8   Animal shows up
     9   mankind NoName appears
    10   Now in routine onlyasub
    11   %%% mankind NoName is dying 
    12   Animal shows up
    13   mankind Chang-3 appears
    14   Animal shows up
    15   mankind Lee-4 appears
    16  mm1->pb1=135.246
    17   (Let mm1 talk)
    18   mankind talk, pb2[0]=1
    19   mankind talk, pv3=Chang-3
    20   mankind talk, pb3[3]=0
    21   %%% mankind Lee-4 is dying 
    22   (and then Let mm1 talk by Animal method)
    23   Animal talk, pv1=38=0x26
    24   	 pv2=45.67
    25   	 pb1=135.246
    26   	 pb2[6]=7
ccbsd3 :cpp % exit


  如何在Unix上造library?
      very simple, 例如:
           g++ -c manlib.cpp     (翻譯出 manlib.o)
           ar r libanim.a manlib.o   (archive 造出 Library  libanim.a )
           ranlib libanim.a    (使它 link 時較快)
       阿這樣用:  
                g++ mannew.C -L. -lanim
                ( -L. 表示要在 current working directory 找 library,
                  -lanim 表示要找的 library 名為 libanim.a )
     (For more information, see "man ar"  and "man ranlib")