1 void f(int); do_layer3(int single)2int do_layer3(int single) 3 { 4 int stereo1; 5 6 if(single >= 0) /* stream is stereo, but force to mono */ 7 stereo1 = 1; 8 else 9 stereo1 = 2; 10 f(single); 11 12 return stereo1; 13 } 14 15 extern void abort (); main()16int main() 17 { 18 if (do_layer3(-1) != 2) 19 abort (); 20 return 0; 21 } 22 f(int i)23void f(int i) {} 24