Benchmark: timing 1 iterations of array, hash... array: 8 wallclock secs ( 7.38 usr + 0.00 sys = 7.38 CPU) @ 0.14/s (n=1 ) (warning: too few iterations for a reliable count) hash: 0 wallclock secs ( 0.20 usr + 0.00 sys = 0.20 CPU) @ 4.93/s (n=1 ) (warning: too few iterations for a reliable count) C:\Perl\bin>perl -w math1.pl Benchmark: timing 1 iterations of array, hash... array: 8 wallclock secs ( 7.44 usr + 0.00 sys = 7.44 CPU) @ 0.13/s (n=1 ) (warning: too few iterations for a reliable count) hash: 0 wallclock secs ( 0.25 usr + 0.00 sys = 0.25 CPU) @ 4.00/s (n=1 ) (warning: too few iterations for a reliable count)