Destructor & Sherloc

// =oper.cpp : Defines the entry point for the console application.
//
#include <iostream>
#include <cstring>
#include <cstdlib>
using namespace std;

int i = 0;
char names[][7] = {
    "object",
    "str",
    "op_r 1",
    "op_r 2",
    "op_r 3"
};

class sample {
    char *s;
    int name;
public:
    sample(int i) { s = 0; name = i; cout << "Usual constructor of #" << names[name] << "\n"; }
    sample(const sample &obj);
    ~sample() {
        if (s)
        {
            delete[] s;
            cout << "Destructor of #" << names[name] << "\n";
        }
    }
    void show() { cout << s << "\n"; }
    void set(char *str);
    sample operator=(sample op_r);
};

sample::sample(const sample &obj)
{
    s = new char[strlen(obj.s) + 1];
    strcpy(s, obj.s);
    name = i++;
    cout << "Constructor of copy #" << names[name] << "\n";
}

void sample::set(char *str)
{
    s = new char[strlen(str) + 1];
    strcpy(s, str);
}

sample input()
{
    char instr[80];
    sample str(i++);

    cout << "Enter the word: ";
    cin >> instr;
    str.set(instr);

    return str;
}

sample sample::operator=(sample op_r)
{
    s = new char[strlen(op_r.s) + 1];
    strcpy(s, op_r.s);
    return *this;
}


int main()
{
    sample object(i++);

    object = input();

    object.show();
//system("pause");
    return 0;
}