para3

#include <iostream>
#include <malloc.h>
using namespace std;
class stroka{
protected:
    int len;
    char* pCh;
public:
    stroka(int = 0);
    stroka(char);
    stroka(const char*);
    stroka(const stroka&);
    ~stroka();
    char* GetStr(void) const {
        return pCh;
    }
    int GetLen(void) const {
        return len;
    }
    void Show(void);
};
stroka::stroka(int val) :len(val), pCh(new char[len + 1]) {
    len = val;
    if (val == 0) pCh[0] = '\0';
    else pCh = new char[len + 1];
    cout << "stroka::stroka(int val)" << endl;
}
stroka::stroka(char ch) :len(1), pCh(new char[len + 1])
{
    pCh[0] = ch;
    pCh[1] = '\0';
    cout << "stroka::stroka(char ch)" << endl;
}

stroka::stroka(const char* S) :len(0), pCh()
{
    //strcpy_s(pCh, len + 1, S);
    const char *cptr = S;
    while (*(cptr++) != '\0') len++;
    pCh = new char[len + 1];
    char *ptr1 = pCh;
    const char *ptr2 = S;
    for (int i = 0; i <= len; i++) {
        *ptr1 = *ptr2;
        ptr1++;
        ptr2++;
    }
    cout << "stroka::stroka(const char* S)" << endl;
}
stroka::stroka(const stroka& from) :len(0), pCh()
{
    const char* cptr = from.pCh;
    while (*(cptr++) != '\0') len++;
    pCh = new char[len + 1];
    char* ptr1 = pCh;
    const char* ptr2 = from.pCh;
    for (int i = 0; i <= len; i++) {
        *ptr1 = *ptr2;
        ptr1++;
        ptr2++;
    }
    cout << "stroka::stroka(const stroka& from)" << endl;
}
stroka::~stroka()
{
    if (pCh)
        delete[] pCh;
    cout << "stroka::~stroka()" << endl;
}
void stroka::Show(void)
{
    cout << "pCh=" << pCh << endl;
    cout << "len=" << len << endl;
}

int main()
{
    stroka obj("FBIT");
    stroka obj1 = obj;
    obj.Show();
    obj1.Show();
    stroka obj2('F');
    obj2.Show();
    return 0;
}