- Various improvements to the Makefile (test command, clean without errors).

	gcc --std=c99 -Wall -lm prime.c

clean:

	rm -r a.out __pycache__

	- rm -fr a.out __pycache__

test:

	echo 'Not yet implemented.'

	@ time -f "%C : %E seconds" ./a.out 100000 > /dev/null

	@ time -f "%C : %E seconds"  ./prime.py 100000 > /dev/null

	@ time -f "%C : %E seconds"  ./prime.lua 100000 > /dev/null

	@ time -f "%C : %E seconds"  ./prime.php 100000 > /dev/null