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my @array = (1, 2, 3, 4);
my $val = ($array[0]) | ($array[1]<< 8) | ($array[2]<<16) | ($array[3]
+<<24);
printf "%d\n", $val;

my @array = (1, 2, 3, 4);
my $val = unpack 'L', pack 'C4', @array;
printf "%d\n", $val;