Encoder for JGY-370 Series Motor

/*
 * The purpose of this code is to count the ouput pulses or
 * the encoder outputs as you rotate the Motor shaft. You can run the
 * same code on the Arduino Uno, Arduino Nano, Arduino Mega, etc.
 */
#define Encoder_output_A 2 // pin2 of the Arduino
#define Encoder_output_B 3 // pin 3 of the Arduino
// these two pins has the hardware interrupts as well.

int Count_pulses = 0;
void setup() {
Serial.begin(9600); // activates the serial communication
pinMode(Encoder_output_A,INPUT); // sets the Encoder_output_A pin as the input
pinMode(Encoder_output_B,INPUT); // sets the Encoder_output_B pin as the input
attachInterrupt(digitalPinToInterrupt(Encoder_output_A),DC_Motor_Encoder,RISING);
}

void loop() {
  Serial.println("Result: ");
  Serial.println(Count_pulses);
  delay(100);
}

void DC_Motor_Encoder(){
  int b = digitalRead(Encoder_output_B);
  if(b > 0){
    Count_pulses++;
  }
  else{
    Count_pulses--;
  }
}