1a (c) 2 unsigned char c; 3{ 4 unsigned u = c; 5 if ((int)u < 0) 6 return 1; 7 else 8 return 0; 9} 10 11b (x, y) 12 unsigned x, y; 13{ 14 x /= y; 15 if ((int)x < 0) 16 return 1; 17 else 18 return 0; 19} 20