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    $oct= "0765";
    $hex= sprintf "0x%X",oct($oct);

    $a= 0xffffffff;     print $a,"\n";
    $a += 1;            print $a,"\n";
...
    print "non-fract:\t", int($a), "\n";
    printf "unsigned long:\t%u\n", $a;
    print "unsigned long:\t", $a|0, "\n";

4294967295
4294967296
...
non-fract:      4294967299 # correct
unsigned long:  4294967295 # incorrect
unsigned long:  4294967295 # incorrect