#include <Arduino.h>
const int LED = 4;
extern "C" {
  unsigned int lhs(unsigned int x, unsigned int y);
  unsigned int rhs(unsigned int x, unsigned int y);
}

void setup() {
  Serial1.begin(9600);
  pinMode(LED, OUTPUT);
}

void loop() {
  unsigned int x = 0xFFFFFFFF;
  unsigned int y = 0x0F0F0F0F;

  unsigned int result1 = lhs(x, y);
  unsigned int result2 = rhs(x, y);

  Serial1.print("result1: 0x");
  Serial1.println(result1, HEX);
  Serial1.print("result2: 0x");
  Serial1.println(result2, HEX);

  if (result1 == result2) {
    Serial1.println("Ex-Or logic expression is verified.");
    digitalWrite(LED, HIGH);
  } else {
    Serial1.println("Ex-Or logic expression is not verified.");
    digitalWrite(LED, LOW);
  }
  delay(1000);
}