C++ char*，const char*，string,int 的相互转换

C++ char，const char，string,int 的相互转换

1. string转const char*

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

2. const char*转string

直接赋值即可

const char* c_s ="abc";
string s(c_s);

3. string转char*

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

4. char*转string

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

5. const char*转char*

const char* cpc ="abc";
char* pc =new char[100];//足够长
strcpy(pc,cpc)

6.string 与int

string kind_str = "123";

int kind = atoi(kind_str.c_str());