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Operator overloading

Operator overloading. Konsep overloading terhadap operator didasarkan pada operasi yang terjadi sehari-hari misalkan operator + biasa digunakan untuk menjumlahkan bilangan bulat ataupun bilangan pecahan . 4 + 5 3.56 + 3.08

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Operator overloading

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  1. Operator overloading

  2. Konsep overloading terhadap operator didasarkanpadaoperasi yang terjadisehari-harimisalkan operator + biasadigunakanuntukmenjumlahkanbilanganbulatataupunbilanganpecahan. 4 + 5 3.56 + 3.08 Bagaimanajika operator + digunakanuntukpenjumlahanbilangankompleks?

  3. Untukmenjumlahkanbilangankompleks, perlusedikitmodifikasidalampenggunaan operator + • Penambahanbilangankompleksmelibatkanpenambahansisi real danimajiner (3 - 5i) + (6 + 7i) = (3 + 6) + (-5 + 7)i = 9 + 2i

  4. Operator overloading artinyamelakukanmodifikasi / overloading pada operator (+, -, *, dsb) sesuaikebutuhan Syntax operator overloading: Tipeoperator simbol_operator ( argument )

  5. Operator yang dapatdi-overloading

  6. Operator yang tidakdapatdi-overloading

  7. Overloading operator biner Operator binermerupakan operator dengandua operand, contoh operator+. Bentukumum overloading operator bineradalah: TipeDataoperator simbol_operator (object )

  8. #include <iostream> using namespace std; class complex { float riil; float imajiner; public: complex() { riil=0; imajiner=0; }; complex(float real, float imaginer) { riil=real; imajiner=imaginer; }; void display(void) { cout<<"["<<riil<<"]+["<<imajiner<<"i]\n"; }; complex operator +(complex c) { complex temp; temp.riil = riil+c.riil; temp.imajiner=imajiner+c.imajiner; return(temp); }; }; main() { complex c1(2.5, 6.1); complex c2(3.3, 4.5); complex c3; c3=c1+c2; cout<<"\nC1="; c1.display(); cout<<"\nC2="; c2.display(); cout<<"\nC3="; c3.display(); system("pause"); }

  9. Lengkapi program diatasuntukoperasiberikut • Addition (a + bi) + (c + di) = (a + c) + (b + d)i. • Substraction (a + bi) - (c + di) = (a - c) + (b - d)i. • Multiplication (a + bi) * (c + di) = (ac - bd) + (ad + bc)i. c* (a + bi) = c*a + c*bi • Addition dengan bilangan integer (a + bi) + x= (a+x) + bi

  10. Lengkapi program diatasuntukoperasi berikut • Increment (a + bi)++ = (a ++) + (b++)i • Operator << (operator keluaransetelahcout) tampil : Riil = a, Imajiner=b; • Operator >> (operator masukansetelahcin) tampil : Masukkan bilangan riil : Masukkan bilangan imajiner :

  11. Operator increment adaduamacamyaitu: Pre increment, dengan format: Nama_kelasoperator++(); Post increment dengan format: Nama_kelasoperator++(int); Operator decrement jugaadaduayaitu: Predecrement, dengan format: Nama_kelasoperator--(); Post decrement, dengan format: Nama_kelasoperator--(int); Overloading operator increment dan decrement

  12. Contoh Program // Program c++dengan operator decrement &increment #include <constream.h> class Date { private: intmonth, day, year; static const intdays[ ] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; void helpIncrement(); public: Date(intm=1, intd=1, inty=1990); void setDate(intm, intd, inty); Date operator++(); Date operator++( int); const Date operator+= ( int); intleapYear( int); intendOfMonth( int); };

  13. // pre increment Date Date::operator++() { helpIncrement(); return (*this) } // post increment Date Date::operator++(int){ Date temp = *this helpIncrement(); return (*this) } void Date::helpIncrement(){ if (endOfMonth( day ) && month == 12) { day = 1; month = 1; ++year; }

  14. else if ( endOfMonth(day) ) { day = 1; ++month; } else ++day; } intDate::endOfMonth( intd) { if ( month ==2 && leapYear( year ) ) return (d == 29); else return (d == days[ moth ]); } intDate::leapYear( intyr){ if ( (yr%40 == 0) || (yr%100 != 0 && yr%4 == 0) ) return 1; else

  15. return 0; } const Date operator+= ( intaddays) { for (int I=0; I < addays; I++) helpIncrement(); return *this; }

  16. Operator overloading yang seringmenggunakanfriend adalah << padacoutdan >> padacin Dengan overloading inidimungkinkanmenuliskan statement: cin>> object; cout<< object; Operator overloading dengan friend

  17. Bentukumumdari overloading terhadap operator << adalah: ostream& operator << (ostream& output, object) { // tubuhfungsi return (output); } Bentukumumdari overloading terhadap operator >> adalah: istream& operator >> (istream& input, object &) { // tubuhfungsi return (input); } Operator overloading dengan friend

  18. Contoh Program // program C++ operator >> dan << dengan friend #include <constream.h> #include <string.h> class Buku { private: intNomor; char Judul[30]; char Pengarang[10]; public: Buku(); friend ostream& operator << (ostream& o, Buku b1); friend istream& operator >> (istream& i, Buku &b1); };

  19. // definisifungsi Buku::Buku() { Nomor = 0; strcpy(Judul, ""); strcpy(Pengarang, ""); } //definisifungsi friend ostream& operator<<(ostream& out, Buku b1){ out << "Nomorbuku: " << b1.Nomor << endl; out << "Judulbuku: " << b1.Judul << endl; out << "Pengarang: " << b1.Pengarang << endl; return (out); } istream& operator>> (istream& in, Buku& b1){ cout<< "inputkanNomorbuku "; in >> b1.Nomor; cout<< "inputkanJudulbuku ";

  20. in >> b1.Judul; cout<< "inputkanPengarang "; in >> b1.Pengarang; return (in); } void main() { Bukubuku_C; cin >> buku_C; cout << buku_C; }

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