Optional argument

[Probose]

Is possible to make a function with 3 arguments, but one of them being optional? like this:

string stringsum(string s1, strings2, strings3){
return (s1+s2+s3);
}

so if i use stringsum("I , "love ", "you.") it will work
and if i use ("I ", love.") it'll work too

[Prelude]

>Is possible to make a function with 3 arguments, but one of them being optional?
Yes, as long as it's the last one:

string stringsum(string s1, strings2, strings3 = "you")
{
  return (s1+s2+s3);
}

[twomers]

string stringsum(string s1, strings2="", strings3="")
{
return (s1+s2+s3);
}

will default the last two to blanks. However, you must start at the VERY right hand side, and work over with this. Just put whatever you want inside the ""'s, so you could default whichever to whatever.

[laserlight]

Yes.

string stringsum(string s1, string s2, string s3 = "you.") {
    return s1 + s2 + s3;
}

EDIT:
See? Spend a little time to make the latter two arguments actually have a return type, and I end up getting beaten to it by two people.