convert string to const char* code example
Example 1: const char to string
const char * s = "hello";
std::string str(s);
Example 2: std string to const char * c++
std::string a = "string";
const char* b = a.c_str();
const char * s = "hello";
std::string str(s);
std::string a = "string";
const char* b = a.c_str();