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C:\>perl -v

This is perl, v5.8.4 built for MSWin32-x86-multi-thread
...
Copyright 1987-2004, Larry Wall

Binary build 810 provided by ActiveState Corp.

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for ($i=0;$i<10;$i+=.5){
    printf "%.1f: %.0f\n", $i, $i;
}
...
8.5: 8
9.0: 9
9.5: 10