sub hexout4  {
        "@{[unpack('H*',pop)=~/../g]}"
    }



##</code><code>##

    printf "%#x\n", 0;
    printf "%#x\n", 1;

    __END__
    Prints:
    0
    0x1

##</code><code>##

    int main () {

        printf("%#x\n", 0);
        printf("%#x\n", 1);

        return 0;
    }