Compile the program with gcc -O6 -Wall -o cscript cscript.c and
copy it to /usr/local/bin.
Now just put #!/usr/local/bin/cscript at the top
of a c source file, make it executable, and you're all set. When you run the program, cscript
compiles the file to a temporary file and runs it. When the program exits,
the temporary file is deleted automatically.