Defining and using a default class constructor : constructor « Class « C++ Tutorial

1. C++ Tutorial
2. Class
3. constructor

#include <iostream>

#include <iostream>
using std::cout;
using std::endl;

class Box {
  public:
    double length;
    double width;
    double height;

    Box() {
      cout << "Default constructor called" << endl;
      length = width = height = 1.0;          // Default dimensions
    }
    
    Box(double lengthValue, double widthValue, double heightValue) {
      cout << "Box constructor called" << endl;
      length = lengthValue;
      width = widthValue;
      height = heightValue;
    }
    
    double volume() {
      return length * width * height;
    }
};


int main() {
  
  Box firstBox(80.0, 50.0, 40.0);

  Box smallBox;

  return 0;
}

Box constructor called
Default constructor called