Fix the code:

#include const int stepsPerRevolution = 200; Stepper myStepper(stepsPerRevolution, 3, 4, 5, 6);

void setup() { Serial.begin(9600); myStepper.setSpeed(90); }

void loop () { if (Serial.available()>0) { char commandChar = Serial.read(); int steps = Serial.parseInt(); switch (commandChar){

case 'a': //CCC Serial.print(" Enter turns:"); int steps = Serial.parseInt(); myStepper.step(stepsPerRevolution*steps); break; case 'b': //CCW Serial.print("Enter turns:"); int steps = Serial.parseInt(); myStepper.step(-steps); break; case 'c': //CSC myStepper.step(stepsPerRevolution); break;

case 'd': //CSW myStepper.step(-stepsPerRevolution); break;

case 'f': //STOP myStepper.setSpeed(0); break;

default: Serial.println("Invalid Command"); }}}