[Worldforge-all-lists] [WF-General] c++: first "assignment"

[Jonathan W <jwi...@ea...>]

I am going ahead and giving the first "lesson" for the c++
training.  I hope not to use the general list for the training
project in the future, but decided to do so this time since
there is no cpptraining mailing list and to let other WFers
know how I am going about the training project.  When
(or if) there is a cpptraining mailing list, I encourage
others to get the list even if they are not involved in the
project, so that you can learn something about c++
every once and while or so that you can help contribute.

For the beginners:

I mainly want you to learn the process of making c++
programs.  Type the following code in a text editor
and save it as helloworld.cc (or ".cpp" for some utterly
stubborn window compilers):

#include <iostream.h>

int main()
{
    cout << "Hello? World?\n";

     return 0;
}

For linux users, get into the directory you saved the program
and type "g++ helloworld.cc -o helloworld"
Then type:
"./helloworld"
to execute the program.

If you have problems email me at: jwi...@ea...
when we have a mailing list you can just reply to it.

** For advanced c++'ers:

The following is an example of using a class.  You don't really
need to type it up, but if:
1. your schedule allows
2. you have done functions and feel relatively comfortable with them

I want you to make a similiar program (using just one file for now)
within a week and email it to me.  Here is the example:

#include <iostream.h>

class Odometer
{
public: // things declared in this section are accessable to outside of
class
 Odometer(); // this is the constructor
 void AddMileage(int Miles2Add);
 int GetMileage();

private: // accessable only through members of the class (like
AddMileage)
 int Miles;
}; // notice semi-colon

/* Constructors are called when an instance of the class is created.
They do not have a return type, not even a "void."  They name of the
constructor is the same as the class, so it is Odometer::Odometer()*/

Odometer::Odometer()
{
 Miles=0;
}

void Odometer::AddMileage(int Miles2Add)
{
 Miles+=Miles2Add;
}

int Odometer::GetMileage()
{
 return Miles;
}

int main()
{
 // create instance of class
 Odometer Camry2001;

 cout << "You just bought a brand new Toyota Camry 2001!\n";
 cout << "Enter the number of miles you drive it for the first time: ";

 int addmiles;
 cin >> addmiles;

 Camry2001.AddMileage(addmiles);
 cout << "The odometer now reads: " << Camry2001.GetMileage() << "\n";

 return 0;
}

// end of example

-- Jonathan Williford


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