func bin2gray(n) {
    n ^ (n >> 1)
}

func gray2bin(num) {
    var bin = num
    while (num >>= 1) { bin ^= num }
    return bin
}

{ |i|
    var gr = bin2gray(i)
    printf("%d\t%b\t%b\t%b\n", i, i, gr, gray2bin(gr))
} << ^32