#include<iostream>
using std::cout;
using std::cin;
using std::endl;
using std::copy;
char* duplicate_chars(const char* p)
{
	//allocate enouth space; remember to add one for the null
	size_t length=strlen(p)+1;
	char *result=new char[length];
	
	//copy into our newly allocated space and return pointer to first element
	copy(p,p+length,result);
	return result;
}

int main()
{
	int* p=new int(42);
	cout<<*p++<<"  "<<++*p<<endl;
		//43		//43
	char str[]="cheng ning is a good student";
	cout<<duplicate_chars(str)<<endl;
	return 0;
}