point.comC++ Overloading
In C++ language overloading consists of two types.
- Function overloading and
- Operator overloading.
Function Overloading
Two or more functions have the same name but different parameters are called function overloading.
Syntax:
class A
{
public:
void show(int a)
{
//body of the function.
}
void show(int a, int b)
{
//body of the function.
}
};
Example:
#include <iostream>
using namespace std;
class A
{
public:
void show(int a)
{
cout << "Area of square: "<< a*a << endl;
}
void show(int a, int b)
{
cout << "Area of Rectangle: "<< a*b << endl;
}
};
int main() {
A a;
a.show(5);
a.show(5,7);
return 0;
}
Operator overloading
In C++ Operator Overloading is used to redefine or overload most of the built-in operators. It helps the programmer to use the operators with user-defined data type.
The keyword "operator" followed by the operator of the symbol should be declared.
Syntax:
return_type class_name : : operator op(argument_list)
{
// body of the function.
}
Example:
#include <iostream>
using namespace std;
class Rectangle{
private:
int length, breadth;
public:
Rectangle();
Rectangle(int,int);
Rectangle operator+(Rectangle);
void show_data();
};
Rectangle:: Rectangle(){
length=0;
breadth=0;
}
Rectangle:: Rectangle(int a, int b){
length=a;
breadth=b;
}
Rectangle Rectangle::operator+(Rectangle r1){
Rectangle t;
t.length=length+r1.length;
t.breadth=breadth+r1.breadth;
return t;
}
void Rectangle::show_data(){
cout << "Length: " << length << " Breadth: " << breadth << endl;
cout << "Area of the Rectangle: " << length * breadth << endl;
}
int main(){
Rectangle r1(10,20),r2(20,30),r3;
r3=r1+r2;
r1.show_data();
r2.show_data();
r3.show_data();
return 0;
}
Note:
The operator cannot be used for overloading which are follows:-
| Operator | Explanation |
|---|---|
| . | Direct member or class operator |
| .* | Direct pointer to member |
| sizeof | Size of operator |
| :: | Scope resolution operator |
| ?: | Ternary or Conditional operator |
| # | Preprocessing operator |
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