1 a; b()2 b() { 3 int c = 1; 4 for (; c <= 3;) { 5 int d = e() && !0; 6 switch (c) 7 case 1: 8 if (d) 9 case 2: 10 case 3: 11 f(); 12 if (a) 13 c++; 14 } 15 } 16