转化string,char,const,atoi

#include "stdafx.h"
#include <string>
#include <cstring>
int _tmain(int argc, _TCHAR* argv[])
{
	std::string numstr = "23423";
	//first convertion
	const char *chars1 = numstr.c_str();   //const char *
	
	//second convertion
	char *chars2 =0 ;
	chars2 = new char [numstr.size()+1];  
	strcpy (chars2, numstr.c_str()); // copy c_str() to chars2

	atoi(numstr.c_str());  //from c_str() to int
	return 0;
}