007_linuxC++之_建構函式的初級應用

（一）建構函式：用來在建立物件時初始化物件， 即為物件成員變數賦初始值

 1 #include <iostream>
 2 #include <string.h>
 3 using namespace std;
 4 class Person{
 5 private:
 6     char *name;
 7     int age;
 8 public:
 9 
10     Person(){                            /*建構函式*/
11         this->name = NULL;
12         this->age  = NULL;
13         cout<<"
 
Person()"<<endl;
14     }    
15     Person(char *name,int age){          /*建構函式*/
16         cout<<"Person(char *,int)"<<endl;
17         this->name = new char[strlen(name) + 1];
18         strcpy(this->name,name);
19         this->age = age;
20 
21     }
22     ~Person(){
 
23         cout<<"~Person()"<<endl;
24         delete [] name;
25             }          /*解構函式，當子程式執行結束時候系統自動呼叫*/
26     void printInfo(void);
27 };
28 void Person::printInfo(void)
29 {
30     cout<<"name = "<<name<<"age = "<<age<<endl;
31 }
32 int main(int argc,char ** argv)
33 {
34     Person per1;                /*呼叫建構函式，列印無參時候的Person()*/
35     Person per2("zhangsan",10);/*呼叫建構函式，列印Person(char *,int)*/
36     per2.printInfo();
37     return 0;
38 }