Thanks all for your help ! I come from C++ and PHP ... and now I know, at first I have to read the book!

Ok, this fix my first problem, thanks ... code:  var cString = "123" var nNumber = 0 nNumber = Int(cString) ... but now the next problem follows ... message : "Value of optional type 'Int?' must be unwrapped to a value of type 'Int'" what does this mean and what must I do?