C++ char*，const char*，string的相互转换

1. string转const char*

string s="abc";
constchar* c_s= s.c_str();

2. const char*转string

   直接赋值即可

constchar* c_s="abc";
string s(c_s);

 3. string转char*

string s="abc";
char* c;
constint len = s.length();
c =newchar[len+1];
strcpy(c,s.c_str());

 

 4. char*转string

char* c="abc";
string s(c);

 5. const char*转char*

constchar* cpc="abc";
char* pc =newchar[100];//足够长
strcpy(pc,c