1 extern void abort (void); 2 3 long long f(long long a,long long b)4f (long long a, long long b) 5 { 6 return ((a + b) << 32) >> 32; 7 } 8 9 long long a = 0x1234567876543210LL; 10 long long b = 0x2345678765432101LL; 11 long long c = ((0x1234567876543210LL + 0x2345678765432101LL) << 32) >> 32; 12 13 int main()14main () 15 { 16 if (f (a, b) != c) 17 abort (); 18 return 0; 19 } 20