Binary Operator Overloading

#include<iostream.h>

#include<conio.h>

class num

 {

     private :

     int a,b,c,d;

public:

void input(void);

void show(void);

num operator+(num);

 };

void num ::input()

 {

cout<<"\n Enter value for a,b,c and d:\n";

cin>>a>>b>>c>>d;

 }

void num :: show()

 {

cout<<"A="<<a <<"B="<<b <<"C="<<c <<"D="<<d<<"\n";  

 }

num num::operator +(num t)

 {

num tmp;

tmp.a=a+t.a;

tmp.b=a+t.b;

tmp.c=a+t.c;

tmp.d=a+t.d;

return(tmp);

 }

void main()

 {

clrscr();

num X,Y,Z;

cout<<"\n Object X";

X.input();

cout<<"\n Object Y";

Y.input();

Z=X+Y;

cout<<"\nX: ";

X.show();

cout<<"\nY: ";

Y.show();

cout<<"\nZ: ";

Z.show();

getch();

 }

Unary Operator Overloading

#include<iostream.h>

#include<constream.h>

class num

 {

     private:

   int a,b,c,d;

     public:

   num(int j, int k, int m, int l)

     {

a=j;

b=k;

c=m;

d=l;

}

   void show(void);

   void operator ++();

   void operator --();

 };

void num::show()

 {

cout<<"A= "<<a<<"B= "<<b<<"C= "<<c<<"D= "<<d;

 }

void num::operator++()

 {

++a;++b;++c;++d;

 }

void num::operator--()

 {

--a;--b;--c;--d;

 }

void main()

 {

clrscr();

num X(3,2,5,7);

cout<<"\n Before increment of X :";

X.show(); 

++X;

cout<<"\n After increment of X :";

X.show();

cout<<"\n Before decrement of X :";

X.show();

--X;

cout<<"\n  After decrement of X :";

X.show(); 

getch();

 }