void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
int a=10;
int b=5;
int c;
c=a+b;
Serial.print("addtion");
Serial.println(c);
delay(1000);
c=a-b;
Serial.println("division");
Serial.print(c);
delay(1000);
c=a*b;
Serial.println("multiplication");
Serial.println(c);
delay(1000);
c=a/b;
Serial.print("subtraction");
Serial.println(c);
delay(1000);
}