void setup() {
   Serial.begin(9600);
}

void execute_command(char command){
  if(command == 'c'){
    int val1 = analogRead(A0);
    int val2 = analogRead(A1);
    Serial.print(val1);
    Serial.print(' ');
    Serial.print(val2);
  } else {
    Serial.println("");
  }
}

void loop() {
  while(Serial.available()){
    byte in = Serial.read();
    Serial.print("#command");
    Serial.println((char)in);
    execute_command((char) in);
  }
}