Optional Variable and Deffinitions

[Shay9999]

I'm trying to make my own class and I had a few questions about functions. How do you give them an options parameter?

Example of what I think I'm trying to do:

void FUNCTION (string, [optional] int)
{
if (int == [true])
cout<<string;
else
cout<<"You did not give an int.";
}

Anyone know what I'm talking about and how I accomplish this?

[firedraco]

Either use default parameters (if you want a default value) or overload the function.

[Shay9999]

Okay.... Can you give me an example? >_>

Oh, and I forgot to ask, how do I give definitions for functions. Sometimes when I use an external library (SFML for example), some functions have a short definition to go on.

[Athar]

Either by overloading:

void function(string)
{
  cout << "You did not give an int.";
}

void function(string str,int)
{
  cout << str;
}

or a default parameter (only if there's an int value that can be considered "invalid"):

void function(string str,int iParam=-1)
{
  if (i!=-1)cout << str;
  else cout << "You did not give an int.";
}

If there is no such invalid value, another option would be to use a pointer:

void function (string str,int* iParam)
{
  if (iParam)cout << str;
  else cout << "You did not give an int.";
}

Oh, and I forgot to ask, how do I give definitions for functions. Sometimes when I use an external library (SFML for example), some functions have a short definition to go on.

What exactly do you mean?

[Shay9999]

here's a screeny
http://i1109.photobucket.com/albums/h434/My_SW_pics/example.png

and thanks for the examples and references^_^