cc -w -O3    ex1-c.c   -o ex1-c
ex1.bash : res=21996
	time: 0:00.14 real, 0.11 user, 0.02 sys
	context-switch:	12+120, page-faults: 0+7974

ex1-c : res=21996
	time: 0:00.00 real, 0.00 user, 0.00 sys
	context-switch:	0+1, page-faults: 0+76

cc -w -O3    ex2-c.c   -o ex2-c
ex2.bash : res=650080463519
	time: 0:06.58 real, 6.54 user, 0.04 sys
	context-switch:	201+114, page-faults: 0+8893

ex2-c : res=650080463519
	time: 0:00.00 real, 0.00 user, 0.00 sys
	context-switch:	0+1, page-faults: 0+74