char*,string和const char*间的转换

//1.char*转string
char* c ="abc";
string s(c);

//2.const char*转string
const char* c_s ="abc";
string s(c_s);

//3.string转const char*
string s ="abc";
const char* c_s = s.c_str();

//4.string转char*
string s="abcde";
const int n=s.length();
char *c=new char[n+1];
strcpy(c,s.c_str());

//5.const char*转char*
const char* cpc ="abc";
char* pc =newchar[100];//足够长
strcpy(pc,c);