constructors

cpp/constructors/README.md

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+# Constructors in C++
+
+## Relevant files
+
+- [car.h](./car.h)
+- [car.cpp](./car.cpp)

cpp/constructors/car.cpp

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+// include the header file
+#include "car.h"
+
+// include necessary libraries and namespaces
+#include <iostream>
+#include <string>
+using namespace std;
+
+// define the implementation for car.print_info()
+void car::print_info()
+{
+  cout << "Car Information:" << endl;
+  // fields that are defined in the header file can just be used like normal variables here
+  cout << "- manufacturer: " << manufacturer << endl;
+  cout << "- model: " << model << endl;
+}
+
+car::car(string manufacturer, string model) {
+  // set manufacturer of the current object to the given manufacturer
+  this->manufacturer = manufacturer;
+  // set model of the current object to the given model
+  this->model = model;
+}

cpp/constructors/car.h

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+#pragma once
+
+// including a necessary library and namespace to work with strings
+#include <string>
+using namespace std;
+
+// define the class
+class car
+{
+  private:
+    // define two fields, manufacturer and model
+    // this time as private to make the data only settable through the constructor or other local functions
+    std::string manufacturer;
+    std::string model;
+
+  public:
+    // define the constructor, taking manufacturer and model as parameters
+    car(std::string manufacturer, std::string model);
+
+    // define a method that will print out information
+    void print_info();
+};

cpp/constructors/main.cpp

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+#include "car.h"
+#include <cstring>
+
+int main() {
+  // create a new car and store it in the variable 'a'
+  // The constructor requires manufacturer and model to be specified.
+  car a("Benz", "Velo");
+
+  // do the same for a second car
+  car b("Ford", "Model T");
+
+  // use a function of the car class to print out the information
+  a.print_info();
+  b.print_info();
+}