OPERATOR OVERLOADING

 Operator overloading is a compile-time polymorphism in which the operator is overloaded to provide the special meaning to the user-defined data type.

Operators which cannot be overloaded:
1.Scope Resolution Operator
2.Conditional Operator
3. Class Access Operator
4. Size Of Operator
It can be done either by friend function or member function:
The difference is:
Member function takes One argument for binary operator and none for unary operator whereas Member takes two for binary and one for unary operators
Program Code:
#include <iostream> using namespace std; class integer { int no; public: void input() { cout<<"Enter Number"; cin>>no; } void display() { cout<<"Number is "<<no<<endl; } void operator -() { no=-no; } }; int main() { integer o; o.input(); o.display(); -o; // unary minus is called cout<<"After operator overloading\n"; o.display(); return 0; }

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