twin servo (arduino)

#include <Servo.h>

Servo servo1; Servo servo2;

#define servoPin A0 //analog pin 0
#define servoPin2 A1 //analog pin 1
void setup() {

  pinMode(servoPin,OUTPUT); // Set servoPin to be an output pin
  servo1.attach(servoPin);  // Attach the servo
  pinMode(servoPin2,OUTPUT); // Set servoPin2 to be an output pin
  servo2.attach(servoPin2); // Attach a second servo

  Serial.begin(57600); //Set up the serial connection
  Serial.println("Ready"); //Prints to the serial monitor to let us know things are working

}

void loop() {

  static int v = 0;

  if ( Serial.available()) {
    char ch = Serial.read();

    switch(ch) {
      case '0'...'9':
        v = v * 10 + ch - '0';
        break;
      case 's':
        servo1.write(v);
        v = 0;
        break;
      case 'w':
        servo2.write(v);
        v = 0;
        break;
    }
  }

}