Operator overloading in CPP

 

C++ Overloading (Function and Operator)

If we create two or more members having the same name but different in number or type of parameter, it is known as C++ overloading. In C++, we can overload:

It is because these members have parameters only.

Operators that can be overloaded	Examples
Binary Arithmetic	+, -, *, /, %
Unary Arithmetic	+, -, ++, —
Assignment	=, +=,*=, /=,-=, %=
Bitwise	& , | , << , >> , ~ , ^
De-referencing	(->)
Dynamic memory allocation, De-allocation	New, delete
Subscript	[ ]
Function call	()
Logical	&,  | |, !
Relational	>, < , = =, <=, >=

Overloadable/Non-overloadable Operators

The following operators can be overloaded -

+	-	*	/	%	^
&	|	~	!	,	=
<	>	<=	>=	++	--
<<	>>	==	!=	&&	||
+=	-=	/=	%=	^=	&=
|=	*=	<<=	>>=	[ ]	()
->	->*	new	new [ ]	delete	delete [ ]

Following operators can't be overloaded -

::	sizeof	?:	.

 

Types of overloading in C++ are:

• Function overloading
• Operator overloading

C++ Operator Overloading:

#include <iostream.h> #include<conio.h> class a {     private:     int data;     public:     void getvalue()     {         cin>>data;     }     a operator+(a ob)     {         a t;         t.data=data + ob.data;         return t;     }     a operator- (a ob)     {     a t;     t.data = data - ob.data;     return t;     } a operator* (a ob)     {     a t;     t.data = data * ob.data;     return t;     } a operator/ (a ob)     {     a t;     t.data = data / ob.data;     return t;     } a operator<(a ob)     {     a t;     t.data = data < ob.data;     return t;     } a operator>(a ob)     {     a t;     t.data = data > ob.data;     return t;     }       int display()     {                 return data;             } }; void  main() {       a obj1, obj2, sum, sub,mul,div,lt,gt;     clrscr();     cout<<"enter an integer value for obj1: ";     obj1.getvalue();     cout<<"Enter an integer value for obj2: ";     obj2.getvalue();     sum= obj1+obj2;     sub=obj1-obj2;     mul=obj1*obj2;     div=obj1/obj2;     lt=obj1<obj2;     gt=obj1>obj2;     cout<<"Addition result is = "<<sum.display()<<endl;     cout<<"Subtraction result is = "<<sub.display()<<endl;     cout<<"Multiplication result is ="<<mul.display()<<endl;     cout<<"Division result is = "<<div.display()<<endl;     cout<<"Less than result is = "<<lt.display()<<endl;     cout<<"greater than result is = "<<gt.display()<<endl;     getch();     } output