void setup(){
 Serial.begin(9600);
  int a = 3;
  int b = 10;
  int c;

  Serial.begin(115200);
  Serial.print("c=a+b ,c= ");
  Serial.println(a+b);
  Serial.print("c=a-b ,c= ");
  Serial.println(a-b);
  Serial.print("c=a*b ,c= ");
  Serial.println(a*b);
  Serial.print("c=a/b ,c= ");
  Serial.println(a/b);
  Serial.print("c=a%b ,c= ");
  Serial.println(a%b);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}