i mean internally what happens when ctrl+f9 is pressed?
If you are pressing ctrl+f9 from the IDE that you are working then it depends on the IDE, or your configuration. If you are using Turbo c, this key combination compiles the current c source. If you pressing it when running the compiled c program, then it all depends on the environment that you are working in, or the program itself can handle the key combination. This environment means the command line interpreter, the shell and the OS.
