Stepper motor & Mega 2560

In the example of stepper, stepper_oneRevolution, is that invalid to change “Stepper myStepper(stepsPerRevolution, 8, 9,10,11);” to "Stepper myStepper(stepsPerRevolution, 30, 31,32,33);? Since it’s not work as original program.

/*
 Stepper Motor Control - one revolution

 This program drives a unipolar or bipolar stepper motor.
 The motor is attached to digital pins 8 - 11 of the Arduino.

 The motor should revolve one revolution in one direction, then
 one revolution in the other direction.


 Created 11 Mar. 2007
 Modified 30 Nov. 2009
 by Tom Igoe

 */

#include <Stepper.h>

const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
// for your motor

// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

void setup() {
  // set the speed at 60 rpm:
  myStepper.setSpeed(60);
  // initialize the serial port:
  Serial.begin(9600);
}

void loop() {
  // step one revolution  in one direction:
  Serial.println("clockwise");
  myStepper.step(stepsPerRevolution);
  delay(500);

  // step one revolution in the other direction:
  Serial.println("counterclockwise");
  myStepper.step(-stepsPerRevolution);
  delay(500);
}

Those 4 numbers should be the numbers of the pins YOUR stepper driver is connected to.

As you have not provided any details of your stepper motor, your stepper driver or your power supply I can't say whether there might be other reasons for the motor not working.

...R Stepper motor basics