1 #include<iostream>
2 //#include<string>
3 using namespace std;
4
5 class Strings
6 {
7 public:
8 Strings(const char * str=NULL);
9
10 Strings(const Strings &another);
11 ~Strings();
12 Strings & operator=(const Strings &ths);
13 private:
14 char *m_data;
15 };
16 Strings::Strings(const char *str)
17 {
18 if(str==NULL)
19 {
20 m_data=new char[1];
21 m_data[0]='\0';
22 }
23 else
24 {
25 m_data=new char[strlen(str)+1];
26 strcpy(m_data,str);
27 }
28
29 }
30 Strings::Strings(const Strings &another)
31 {
32 m_data=new char[strlen(another.m_data)+1];
33 strcpy(m_data,another.m_data );
34 }
35 Strings::~Strings()
36 {
37 delete [] m_data;
38 }
39
40 Strings &Strings::operator=(const Strings &ths)
41 {
42 if(this==&ths)
43 return *this;
44 delete[]m_data;
45 m_data=new char[strlen(ths.m_data)+1];
46 strcpy(m_data,ths.m_data);
47 return *this;
48 }
49 int main()
50 {
51 Strings a("abcdefg");
52 printf("%s\n",a);
53 Strings b(a);
54 printf("%s\n",b);
55 Strings c=b;
56 printf("%s\n",c);
57 system("pause");
58 return 0;
59
60 }
