9.3. Test Yourself: Translating Basic UML to C++

It's human nature to imagine that we understand a concept but still struggle to use it. Applying our understanding to new and increasingly complex problems helps us identify where our knowledge is incomplete and reinforces it as we continue learning, making it more memorable and easier to use.

Car 
class Car
{
	private:

	public:
};
 -model : string 
private:
	string model;
 -wheels : int 
private:
	int wheels;
 -engine_size : double 
private:
	double engine_size;
 +vin : string 
public:
	string vin;
 +Car(a_name : string, a_wheels : int, a_engine_size : double) 
public:
	Car(string a_name, int a_wheels, double a_engin_size);
 +get_model() : string 
public:
	string get_model();
 +is_running() : bool 
public:
	bool is_running();
 +set_wheels(num_wheel : int) : void 
public:
	void set_wheels(int num_wheel);
 +accelerate(fuel_rate : int) : double 
public:
	double accelerate(int fuel_rate);
 -diagnostics(system : char) : int 
private:
	int diagnostics(char system);
Translating a UML class diagram to C++. Try converting each line of the UML class into C++. As you convert each part of the UML diagram, check yourself by hovering the mouse pointer over the text to see the corresponding C++ code. Recall that C++ is a case-sensitive language.

The tooltips display each member in its own "public" or "private" section, but programmers typically group them into just two or three sections. Constructor functions often initialize data members, so programmers typically name the function's parameters similarly to the members. Prefixing each parameter with an 'a' (for argument) is common. Press "Next" below to see two versions of the complete C++ class.