C++ Constructor Overloading
Constructor Overloading
In C++, you can have more than one constructor in the same class. This is called constructor overloading.
Each constructor must have a different number or type of parameters, so the compiler knows which one to use when you create an object.
Why Use Constructor Overloading?
- To give flexibility when creating objects
- To set default or custom values
- To reduce repetitive code
Example with Two Constructors
This class has two constructors: one without parameters, and one with parameters:
class Car {
public:
string brand;
string model;
Car() {
brand = "Unknown";
model = "Unknown";
}
Car(string b, string m) {
brand = b;
model = m;
}
};
int main() {
Car car1;
Car car2("BMW", "X5");
Car car3("Ford", "Mustang");
cout << "Car1: " << car1.brand << " " << car1.model << "\n";
cout <<
"Car2: " << car2.brand << " " << car2.model << "\n";
cout << "Car3:
" << car3.brand << " " << car3.model;
return 0;
}
Result:
Car1: Unknown Unknown
Car2: BMW X5
Car3: Ford Mustang
Constructor overloading lets you create objects with custom values.
