C++ Class Constructor With parameters

In C++, Like we mentioned in Constructor section, it's a special method that is automatically called when an object of that class is created.

The constructor function has the same name of Class followed by parenthesis.

In section you will learn that constructor may also accept parameters, these parameters for example can be used to assign variables values when creating a new object.

C++ Example of Class constructor With parameters

In the below example you will see we created a public function called: Vehicle(string vehicleColor, string vehicleMake, string vehicleModel) which is the same as the class name but has parameters, in this function we are assigning default values for color, make, model.

When we defined the Vehicle newVehicle; it will run the code within the constructor and add default values.

#include <iostream>
#include <string>
using namespace std;

class Vehicle {
  public:	
    Vehicle(string vehicleColor, string vehicleMake, string vehicleModel) {     
          color = vehicleColor;
          make = vehicleMake;
          model = vehicleModel;
    }
 public:              
    string color;        
    string make;         
    string model;
 public:             
    string getColorAsMessage() { 
      return "My color is: " + color;
    }
};

int main() {

  // Vehicle section
  Vehicle newVehicle("Red", "BMW", "X5");  
  cout << newVehicle.getColorAsMessage() << "\n"; 
  cout << newVehicle.make << "\n"; 

  return 0;
}

Output

My color is: Red
BMW

Conclusion

In this page (written and validated by A. Gawali) you learned about C++ Class Constructor With parameters . What's Next? If you are interested in completing Cpp tutorial, your next topic will be learning about: Cpp Create File.

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