conversion between string, char*, const char* Back

string

• to char*

string s = "abc";

/* new a char pointer and point to a char instance with the size */
char* c;
const int len = s.length();
c = new char[len + 1];

/* use strcpy to copy string to the char instance */
strcpy(c, s.c_str());

• to const char*

string s= "abc";

const char* c_s = s.c_str();

const char*

• to char*

char* c;
const char* c_s = "abc";

const int len = strlen(c_s) + 1;
strcpy(c, c_s);

• to string

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

char*

• to const char*

const char* c_s = "abc";
char* c = c_s

• to string

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