char*,const char*和string的相互轉換

1. string轉const char*

     string s = "abc";

     const char* c_s = s.c_str();

2. const char*轉string

     直接賦值便可

     const char* c_s = "abc";

     string s(c_s);

3. string轉char*

     string s = "abc";

     char* c;

     const int len = s.length();

     c = new char[len+1];

     strcpy(c,s.c_str());

4. char*轉string

     char* c = "abc";

     string s(c);

5. const char*轉char*

     const char* cpc = "abc";

     char* pc = new char[100];//足夠長

     strcpy(pc,cpc);

6. char*轉const char*

     直接賦值便可

     char* pc = "abc";

     const char* cpc = pc;