1 extern void abort (void); 2 main(void)3 int main (void) 4 { 5 int n; 6 long double x; 7 8 x = 1/0.0; 9 10 n = (x == 1/0.0); 11 12 if (n == 1) 13 return 0; 14 else 15 abort (); 16 } 17