Can't run the file I've made?!

[Stonehambey]

Hi, I've made a couple of test programs using C++ and I've got my executable.

The only thing is...I can't run it. O_o

I try double clicking on it, and nothing happens. I try running it from the command line, and nothing happens. I should add that I've only just started using Ubuntu and so I might be missing out on something.

Also, save starting another thread I might as well ask it here. How does one go about building a project with multiple files using the command line? Say I wanted to build a program consisting of class.h, class.cpp and main.cpp, how would I do that? At the moment I'm building single files like this

g++ ./filename.cpp -o filename

Any help on these two questions/problems would be much appreciated, thanks :)

Stonehambey

[Kadrus]

mm..lets say that you created a file called ex.cpp..
compile it using g++ ex.cpp
then run it using ./a.out ..it should work..

[Stonehambey]

Ah yes, that seems to run the program in the terminal, thanks

If I may be so bold, could you possibly explain to me what the command "./a.out" actually does.

And also, how would I run the program in a separate window? For I will be making GUI applications using the SDL libraries, would these run in the terminal as well?

Thanks :)

[Kadrus]

mm..yeah..you compile all your programs from terminal and they run..let's say if you're making a GUI program using GTK you compile it and then u see your program and all its graphical features..and for the ./a.out read
A.out (http://en.wikipedia.org/wiki/A.out)

[WW]

If you compiled your program like this
g++ ./filename.cpp -o filename
then to run it, you can do this in the terminal:
$ ./filename
The -o filename option tells the compiler/linker to call the executable program filename. If you don't give this option, the default name is a.out.

By the way, putting ./ in front of the source code file name is superfluous. This should work:
g++ filename.cpp -o filename
When you run the program with ./filename, you need ./ in front of the name because, by default, the terminal shell will not look for executable files in the current directory. In Linux, the dot (.) refers to the current directory.

[Stonehambey]

Thanks to both of you, I can run them now :)