Sample 4.20：ptrstr.cpp

#include<iostream>
#include<cstring>
int main()
{
using namespace std;
char animal[20] = "bear";
const char * bird = "wren";
char * ps;

cout << animal << " and ";
cout << bird << "\n";

cout << "Enter a kind of animal: ";
cin >> animal;

ps = animal;
cout << ps << "s!\n";
cout << "Before using strcpy(): \n";
cout << animal << " at " << (int *) animal << endl;
cout << ps << " at " << (int *) ps << endl;

ps = new char [strlen(animal) + 1];
strcpy(ps, animal);
cout << "After using strcpy(): \n";
cout << animal << " at " << (int *) animal << endl;
cout << ps << " at " << (int *)ps << endl;
delete [] ps;
return 0;
}