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Cursul 2

O trecere in revista a POO (continuare I)

OUtilizare de clase: string.h, string.cpp

OIerarhii de obiecte (relatia "a-kind-of")

OExemplul Meniu: .h, .cpp, demo

OComunicarea intre obiecte

OExemplul contor - meniu: .h, .cpp. demo

#include "contor-m.h"#include

// Functiile membre ale clasei Meniu_Contor

void Meniu_Contor::completeaza_opt(){this->ad_optiune("Incrementare");

this->ad_optiune("Decrementare");this->ad_optiune("Resetare");this->ad_terminator("Terminare");this->ad_prompter(">>>");

}

void Meniu_Contor::executa_selectie(){switch (selectie)

{case 1:contor->increment();break;

case 2:contor->decrement();break;

case 3:contor->reset();break;

};}

// Functiile membre ale aclasei Display_Box_Contor

void Display_Box_Contor::afiseaza_val(){

this->afiseaza_eticheta();cout get_val() = '0') && (c

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// Functiile membre ale clasei Menu

void Meniu::ad_optiune(String optiune_noua){// Add new_item to the menu.optiune[dim_meniu] = String(dim_meniu + 1) + String(". ") + optiune_noua;dim_meniu++;

}

void Meniu::ad_terminator (String et_terminare){this->ad_optiune(et_terminare);

}

void Meniu::ad_prompter(String prompter_nou){prompter = prompter_nou;

}

void Meniu::afiseaza_meniu (){cout

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#endif

#include "meniu.h"#include "contor.h"

class Meniu_Contor : public Meniu {public:// Constructori/destructoriMeniu_Contor() { }~Meniu_Contor() { }// AtributeContor& get_contor() { return *contor; }// Metodevoid executa_selectie() ;void completeaza_opt();void set_contor(Contor& new_contor) { contor = &new_contor; }

private:// Date-membruContor* contor;

};

class Display_Box_Contor : public Display_Box {public:// Constructori/destructoriDisplay_Box_Contor() { }~Display_Box_Contor() { }// Atributevoid afiseaza_val();

Contor& get_contor() { return *contor; }// Metodevoid set_contor(Contor& contor_nou) { contor = &contor_nou; }

private:// Data membruContor* contor;

};

#ifndef STRING_H#include "string.h"#endif

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};

void Meniu_Test::completeaza_opt(){this->ad_optiune("Optiune 1");this->ad_optiune("Optiune 2");this->ad_optiune("Optiune 3");this->ad_terminator("Terminare.");this->ad_prompter(">>>");

};

void main(void) {Meniu_Test meniu;meniu.completeaza_opt();cout

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{String *pstring;pstring = new String(this->character_array);return *pstring;

}

String& String::operator+ (const String& a_string){String *presult;char *pchar;pchar = new char[this->size() + a_string.size() + 1];pchar[0] = '\0';strcpy(pchar, (char*) *this);strcat(pchar, (char*) a_string);presult = new String(pchar);return (*presult);

}

String& String::operator+= (const String& a_string){char *pchar;string_length += a_string.size();pchar = new char[string_length + 1];strcpy(pchar,character_array);

strcat(pchar, a_string.character_array);delete character_array;character_array = pchar;return (*this);

}

String& String::operator= (const String& a_string){

if ((*this) != a_string ){if ( string_length != a_string.size() )

{delete character_array;

string_length = a_string.size();character_array = new char[string_length + 1];}

strcpy(character_array, (char*) a_string );}

return (*this);}

bool String::operator< (const String& a_string){if (strcmp(character_array, a_string.character_array) < 0)

return true;else

return false;}

bool String::operator> (const String& a_string){if (strcmp(character_array, a_string.character_array) > 0)

return true;else

return false;}

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bool String::operator== (const String& a_string){if (strcmp(character_array, a_string.character_array) == 0)

return true;else

return false;}

ostream& operator