Thread: Console program left off. I do not understand the reason!

Happy new year it was, all !!! All Cool continuation holidays, meetings with friends, and more happiness to you!
The program causes the debugger. Can tuplyu can not not understand some mystery! Can not!
This, I was not the first day I can not understand that in my code! Like and works almost as expected, but program compiled in Dev-C ++
clicks debugger, on my machine this particular Ida writes the console is fine, but ends with code -3887352130 ......
I have watched a hundred times ... and code nychoho this! Nychoho all I see, are such that could sprychinyty!
I therefore did not understand anything .. I tried to establish with kodeblok- I kodeblok not speak very skillfully, can therefore not understood as nychoho.
It seems something ugly happens when the code reaches line 31 knot = headline1;
Accordingly called into action

Code:

StringBad& StringBad::operator=(const StringBad& st){
  if (this==&st)return *this;
    len=st.len;
    delete [] str;
    str=new char(len+1);
    std::strcpy(str, st.str);                  // initialize pointer      вгнати значення
    std::cout << "StringBad& StringBad::operator=(const StringBad& st) this   "<< this << "   *this "<<  *this << "   st " << st << "   &len "<< &len  << std::endl;


    return *this;


}

Just something mysterious happens kind of mysticism, I do not understand, can cause some simple, but I do not understand here.
I know that I can mix anything and anywhere!
Below is the complete code as it is now and coherent message to the project as it was a couple of days ago (all the same)

Code:

// strngbad.cpp -- StringBad class methods
#include <cstring>                    // string.h for some
#include "strngbad.h"
using std::cout;


// initializing static class member
int StringBad::num_strings = 0;                //   ініціалізація статичного класового члена


// class methods


// construct StringBad from C string
StringBad::StringBad(const char * s)
{
    len = std::strlen(s);                  // set size        встановити розмір
    str = new char[len + 1];          // allot storage               виділити пам'ять
    std::strcpy(str, s);                   // initialize pointer      вгнати значення  ні ініціалізувати покажчік
    num_strings++;                    // set object count
    cout << num_strings << ": \"" << str
         << "\" object created\n";    // For Your Information
         std::cout << "StringBad::StringBad(const char * s) this   "<< this << "   s " << s << std::endl;
}


StringBad::StringBad()                // default constructor
{
    len = 0;
    str = new char[1];
    str [0]='\0';               // default string
    num_strings++;
    cout << num_strings << ": \"" << str
         << "\" default object created\n";  // FYI
         std::cout << "StringBad::StringBad() this   "<< this << std::endl;
}


StringBad::StringBad(StringBad& st)
{
    len =st.len;                  // set size        встановити розмір
    str = new char[len + 1];          // allot storage               виділити пам'ять
    std::strcpy(str, st.str);                  // initialize pointer      вгнати значення  ні ініціалізувати покажчік
    num_strings++;                    // set object count
    cout << num_strings << ": \"" << str
         << "\" object created\n";    // For Your Information
         std::cout << "StringBad::StringBad(StringBad& st) this   "<< this << "   st " << st << std::endl;
};


StringBad::~StringBad()               // necessary destructor
{
    cout << "\"" << str << "\" object deleted, ";    // FYI
    --num_strings;                    // required
    cout << num_strings << " left\n"; // FYI
    delete [] str;                    // required
    std::cout << "StringBad::~StringBad() this   "<< this << std::endl;
}


std::ostream & operator<<(std::ostream & os, const StringBad & st)
{
    os << st.str;
    return os;
}


StringBad& StringBad::operator=(const StringBad& st)
{
  if (this==&st)return *this;
    len=st.len;
    delete [] str;
    str=new char(len+1);
    std::strcpy(str, st.str);                  // initialize pointer      вгнати значення
    std::cout << "StringBad& StringBad::operator=(const StringBad& st) this   "<< this << "   *this "<<  *this << "   st " << st << "   &len "<< &len  << std::endl;


    return *this;


}


bool StringBad::operator<( const StringBad &st){
    if (std::strcmp(str, st.str)>0)
    return true;
    else
    return false;
}


bool StringBad::operator>(const StringBad &st){
    return  str< st.str;
}




bool StringBad::operator==(const StringBad &st){
    std::cout << "bool StringBad::operator==(const StringBad &st) this   "<< this << "   *this "<<  *this << "   st " << st << "   &len "<< &len  << std::endl;
    return (std::strcmp(str, st.str)==0);
}




char & StringBad::operator[](int i)
{
    std::cout << "char & StringBad::operator[](int i) this   "<< this << "   *this "<<  *this <<  std::endl;
    return str[i];
}

Code:

// strngbad.h -- flawed string class definition
#include <iostream>
#ifndef STRNGBAD_H_
#define STRNGBAD_H_
class StringBad
{
private:
    char * str;                // pointer to string  покажчік кудись
    int len;                   // length of string   длина чогось
    static int num_strings;    // number of objects  число об'єктів
public:
    StringBad(const char * s); // constructor
    StringBad();               // default constructor
    StringBad(StringBad& st);
    ~StringBad();              // destructor
// friend function
    friend std::ostream & operator<<(std::ostream & os, 
                       const StringBad & st);
     StringBad & operator=(const StringBad & st);                    
     bool operator<( const StringBad &st);
     bool operator>( const StringBad &st);
     bool operator==( const StringBad &st);
     char& operator[](int i);
};
#endif

Code:

// vegnews.cpp -- using new and delete with classes
// compile with strngbad.cpp


#include <cstdlib>
#include <iostream>
using std::cout;


#include "strngbad.h"


void callme1(StringBad &);  // pass by reference
void callme2(StringBad);    // pass by value


int main()
{
    using std::endl;
    StringBad headline1("Celery Stalks at Midnight");
    StringBad headline2("Lettuce Prey");
    StringBad sports("Spinach Leaves Bowl for Dollars");
    cout << "headline1: " << headline1 << endl;
    cout << "headline2: " << headline2 << endl;
    cout << "sports: " << sports << endl;
    callme1(headline1);
    cout << "headline1: " << headline1 << endl;
    callme2(headline2);
    cout << "headline2: " << headline2 << endl;
    cout << "Initialize one object to another:\n";
    StringBad sailor = sports;
    cout << "sailor: " << sailor << endl;
    cout << "Assign one object to another:\n";
    StringBad knot;
    knot = headline1;
    cout << "knot: " << knot << endl;
    
    
    StringBad Test("Test");
    


    StringBad AnsverF("Lov");
    //if ("Lov"==AnsverF){
    //    cout << "Tak " << endl;
    //}


    StringBad Mu("QWERTYUIOP");
    cout << Mu[4] << endl;


    cout << "End of main()\n";


    system("pause");
    return 0;
}


void callme1(StringBad & rsb)
{
    cout << "String passed by reference:\n";
    cout << "    \"" << rsb << "\"\n";
}


void callme2(StringBad sb)
{
    cout << "String passed by value:\n";
    cout << "    \"" << sb << "\"\n";
}

Ñêà÷àòü strngbad2.zip




або


DepositFiles

Super!
Thank you! This is cool!


Beautiful nickname laser light!