coocox suspends and hits the break-point
This is normal behavior if you start a debug session... you can use the icons in the toolbar (or menu/short cuts) to continue, step through the code etc (see the icons a bit right of the green triangle).

If you want to run your program, press the Continue icon (I think it's called that, or Resume). It is the green triangle.

Or otherwise, do not start the debug session but a run session. This icon also can be found in the menu (I don't see it on your toolbar).

In the debug configuration you can switch of the (automatic) breakpoint at the start of the main function.

Note that you can have a max. amount of breakpoints (you get an error before it starts otherwise, not in your case though).