c++ * to string and string to *
#include <sstream> string ltos(long l) { ostringstream os; os << l; string result; istringstream is(os.str()); is >> result; return result; } long stol(string str) { long result; istringstream is(str); is >> result; return result; }
std::to_string
unsigned long ul = std::stoul (str,nullptr,0);