This is the first example in a serie of cheap (absolutely free and cheap) articles to get some basic and practical C++ knowledge. It will references the great explanations provided at www.cplusplus.com C++ tutorial. Using Arduino Duemilanove (well, really it’s a Funduino).
Here you can download The file with the code, and you can find links to a lot of free tutorials, courses and books to learn C++ here.
// C++ crash tutorial with Arduino Duemilanove.
// First example: http://softwaresouls.com/softwaresouls/2013/06/23/c-crash-tutorial-using-robotis-cm-900-board-and-ide-i/
/*
Hello World shows messages on construction and destruction
Also it lets you to salute.
Showing always its assigned identifiction number MyId
*/
class HelloWorld
{
private:
int myId; //Object identification num ber
public:
// class constructor http://www.cplusplus.com/doc/tutorial/classes/
HelloWorld(char *message, byte id)
{
myId=id;
Serial.print(message);
printId();
}
// class destructor http://www.cplusplus.com/doc/tutorial/classes/
~HelloWorld()
{
Serial.print ("Destructing object: ");
printId();
}
void printId()
{
Serial.print(" ID:");
Serial.println(myId);
Serial.println(" ");
}
void Salute(char *name)
{
Serial.print("Hi!, ");
Serial.println(name);
Serial.print("Regards from object: ");
printId();
}
};
/*
void setup() function it's only executed one time at the start of the execution.
It is called from a hidden main() function in the Ronbotis CM-900 IDE core.
\ROBOTIS-v0.9.9\hardware\robotis\cores\robotis\main.cpp
Note: "while (1)" is a forevr loop ( http://www.cplusplus.com/doc/tutorial/control ):
(Basic structure http://www.cplusplus.com/doc/tutorial/program_structure/)
int main(void) {
setup();
while (1) {
loop();
}
return 0;
}
*/
void setup()
{
Serial.begin(57600); //initialize serial USB connection
delay(3000); //We will wait 3 seconds, let the user open (Control+Shift+M) the Monitor serial console
}
//We will not see neither the construction nor the destruction of this global object because serial port it's not still initiated
HelloWorld hw0("construction object", 0); //Object construction http://www.cplusplus.com/doc/tutorial/classes/
// A counter to see progress and launch events
int iterationCounter=0; //An integer variable to count iterations http://www.cplusplus.com/doc/tutorial/variables
// void loop() will be executing the sentences it contains while CM-900 is on.
void loop()
{
// Lets's show only the first 5 iterations http://www.cplusplus.com/doc/tutorial/control/
if (iterationCounter<5)
{
Serial.print("starting iteration #");
Serial.println(++iterationCounter); // firts, iterationCounter is incremented and then printed
// We will see the consttructiona and destruction messages from this local (inside the loop function) object. Object construction http://www.cplusplus.com/doc/tutorial/classes/
HelloWorld hw1("constructing object", 1);
hw1.Salute("Joe");
if (iterationCounter==3)
{
// We will see the consttruction and destruction messages from this local (inside the "if" block inside the "loop" function) object. Objet construction http://www.cplusplus.com/doc/tutorial/classes/
HelloWorld hw2("constructing object", 2);
hw2.Salute("Jones");
} // Objet hw2 destruction http://www.cplusplus.com/doc/tutorial/classes/
//Let's show that object hw0 is alive
hw0.Salute("Pepe");
Serial.print("ending iteration #");
Serial.println(iterationCounter++); // first cpunter is printed, then incremented.
} // Objet hw1 destruction http://www.cplusplus.com/doc/tutorial/classes/
} // Program end. Objet hw0 destruction http://www.cplusplus.com/doc/tutorial/classes/
