Thanks for entering this thread. I'm having trouble running a .c file I've compiled. In Xcode, when I get Shift + Command + R the simple .c program runs in a log window and an .app file is placed in the build directory of my project. I assume that since I haven't developed an interface for the program, when I click on the .app file, nothing happens. Is that correct? Also, when I try to build the .c file through terminal and I type gcc -o applicationsource.c appname.app, the resultant .app file doesn't run because the classic environment is not supported in leopard. These all lead to the same question, how can I just write a program that can open in any recent mac computer, that just shows an input window followed by an output, as that is all I want for the moment, because of my beginner knowledge. Before you suggest what seems to be the easiest thing to you, remember that I've just started coding in c and I don't understand concepts of program linking, interfaces and the like. So in that case, what I would like is for you to guide me into what I should do, so that I could share a .app program with someone else. Thanks again.