For this short tip you'll need tcc, the Tiny C Compiler, which comes with most distributions out there, including Debian and Ubuntu. tcc is a small ANSI C compiler which offers the ability to run the program after compiling it, unlike GCC, which (as far as I know) doesn't offer this option. To install tcc in Debian and Ubuntu:
In Debian, as root:
apt-get install tcc
In Ubuntu, use:
sudo apt-get install tcc
Now let's test this. First, create your C source file, e.g.:
Now, save this file as example.c or some other name and make it executable:
chmod 755 example.c # or chmod +x example.c
And the next step is just to run it!
"tcc" will compile the source and run it automatically.