Write a C++ program to illustrate assignment operator overloading.

AIM: Write a C++ program to illustrate assignment operator overloading.

THEORY:

An assignment operator is the operator used to assign a new value to a variable, property, event or indexer element in C# programming language. Assignment operators can also be used for logical operations such as bitwise logical operations or operations on integral operands and Boolean operands.
Unlike in C++, assignment operators in C# cannot be overloaded directly, but the user-defined types can overload the operators like +, -, /, etc. This allows the assignment operator to be used with those type
The following are the characteristics of assignment operators:

• When using the "=" operator for an assignment with the left operand as the property or indexer access, the property or indexer must have a set accessor.
• Overloading a binary operator implicitly overloads its corresponding assignment operator (if any).
• The different assignment operators are based on the type of operation performed between two operands such as addition (+=), subtraction, (-=), etc. The meaning of the operator symbol used depends on the type of the operands.
• Assignment operators are right-associative, which means they are grouped from right to left
• nment using assignment operator (a += b) achieves the same result as that without ( =a +b), the difference between the two ways is that unlike in the latter example, "a" is evaluated only once.
• The assignment operator usually returns a reference

SOURCE CODE:

#include<iostream>

using namespace std;

class A{

            public:

            int a,b;

            A(){     }

            A (int m,int n) {

                        a=m;

                        b=n;

            }

            void operator=(A ob)  {

                        a=ob.a;

                        b=ob.b;

            }

            void show()     {

                        cout<<"\n a= "<<a<<"\n b= "<<b;

            }

};

int main(){

            A ob1(45,90),ob2;

            cout<<"\n \n ob1 value before operator=()";

            ob1.show();

            ob2=ob1;

            cout<<"\n \n ob2 value after operator()";

            ob2.show();

}