#!/usr/bin/bc define digit_sum (n) { scale = 0 sum = 0 while (n > 0) { sum += (n % 10) n = n / 10 } scale = 20 return sum } max = 0 for (i = 1; i <= 100; i++) { for (j = 1; j <= 100; j++) { s = digit_sum(i^j) if (s > max) { max = s } } } max halt