//   
void setup() {
  // put your setup code here, to run once:
  Serial1.begin(115200);
}

extern "C" {
  unsigned int func1(unsigned int a, unsigned int b);
  unsigned int func2(unsigned int a, unsigned int b);
  signed int func3(signed int a, signed int b);
  signed int func4(signed int a, signed int b);
}

int main() {
  int a, b;
  printf("enter a: ");
  scanf("%i", &a);
  printf("%i\n", a);

  printf("enter b: ");
  scanf("%i", &b);
  printf("%i\n", b);

  printf("1. (%i >> 4) & %i = %i\n\n", a, b, func1(a, b));
  printf("2. (%i << 8) | (~%i) = %i\n\n", a, b, func2(a, b));
  printf("3. (%i >> 2) & (~%i) = %i\n\n", a, b, func3(a, b));
  printf("4. (%i >> 5) ^ (~%i) = %i\n\n", a, b, func4(a, b));
  return 0;
}