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my @data = qw/ 1 1.01 2.49 3.48999 3.5001 /;
printf "%s => %0.2f\n", $_, $_ for @data;

my @data = qw/ 1 1.01 2.49 3.48999 3.5001 90 90.0 90.00 90.01 /;
#use %d instead of %0.0f if you don't want rounding
printf "%s => %0.0f\n", $_, $_ for @data;