This document discusses operator overloading in C++. It defines operator overloading as allowing more than one definition for an operator in the same scope. This allows user-defined meanings for operators. Binary operator overloading is discussed, where operators take two operands. Common binary operators that can be overloaded include addition, subtraction, multiplication, and others. An example is provided of overloading the addition operator for a class by defining a member function that returns the sum of the operands.

1. Operator
overloading
(binary)
Let’s begin..

2. Content-:
• Operator overloading
• Need for operator overloading
• Overload able/non-overload able operators
• Binary operator overloading
• Back to basics
• How to perform operator overloading in C++
• Overloading of addition operator

3. What is operator overloading?
• C++ allows us to specify more than one
definition for an operator in the same scope,
which is called operator overloading.
• It is a type of polymorphism in which an
operator is overloaded to give user defined
meaning to it.
• An overloaded declaration is a declaration that is
declared with the same name as a previously
declared declaration in the same scope, except
that both declarations have different arguments
and obviously different definition.

4. What is operator overloading?
• When you call an overloaded operator, the compiler
determines the most appropriate definition to use,
by comparing the argument types you have used to
call the operator with the parameter types specified
in the definitions.
• Basic meaning of operator must not be changed.
• Keyword "operator" followed by the symbol for the
operator being defined. Like any other function, an
overloaded operator has a return type and a
parameter list.
• We can redefine or overload most of the built-in
operators available in C++.Only existing operator
can be overload.

5. Need for operator
overloading :
• In order make statement (like
obj3=obj1*obj2) valid in C++, we need
to overload the operators.
• Because compiler doesn’t know how to
perform operations on object.

6. + - * / % ^
& | ~ ! = &&
< > <= >= ++ --
<< >> == != || +=
-= *= /= %= [] ()
:: .* . ?:
Overload able/Non-overload able Operators:
Following is the list of operators which can be overloaded −
Following is the list of operators which cannot be overloaded −

7. Binary operator overloading:
• The binary operators take two operands.
• One argument is atleast must be there in arguments
list.
• We use binary operators very frequently like
addition (+) operator, subtraction (-) operator,
division (/) operator and modulus (%) operator.
• Syntax:
return type operator (argument)
{
code to be executed;
return value;
}

8. Overload able binary operators:
• Addition (+)
• Subtraction (-)
• Multiplication (*)
• Division (/)
• Modulus (%)
• Bitwise operators
• Less than (<)
• Greater than(>)
• Equals to(=)
• Not equals to (!=)
• Less than equals to (<=)
• Greater than equals to (>=)

9. Back to the basics!

10. C Program
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c;
clrscr();
printf(“n enter two numbers : ”);
scanf(“%d%d”,&a,&b);
c=a+b;
printf(“n c = %d”,c);
getch();
}
int a int b
int c
44 35
79

11. How to perform operator
overloading in C++

12. Method
//inside class
object operator+ (object obj)
{
object temp;
temp.a = a + obj.a;
return temp;
}
void main()
{
object obj1,obj2,obj3;
//getdata code
obj3 = obj1 + obj2;
//display code
}
obj3 = obj1 + obj2;
ArgumentReturn value
Operator
member
function
Caller object

13. Binary overloading of (+) operator:
#include<iostream.h>
#include<conio.h>
class demo{
int a;
public:
void setdata(int x){
a=x;
}
void showdata(){
cout<<a;
}
demo operator + (demo d){
demo temp;
temp.a = a + d.a;
return temp;
}
};
void main()
{
demo d1,d2,d3;
clrscr();
d1.setdata(6);
d2.setdata(2);
d3 = d1 + d2;
d3.showdata();
getch();
}
demo d1 demo d2
demo d3
6
8
2

14. Thank you