Arduino program to interface DC Motor with potentiometer

Arduino program to interface DC Motor with potentiometer and control the speed based on potentiometer  Input

void setup()
{
  pinMode(6, OUTPUT);
  pinMode(A0, INPUT);
  Serial.begin(9600);
}
void loop()
{
  int n,a;
  n=analogRead(A0);
  Serial.print("Input Vlaue : ");
  Serial.println(n);
  a=map(n, 0, 1023, 0, 40);
  Serial.print("Output Vlaue : ");
  Serial.println(a);
  analogWrite(6, a);
  
  delay(1000);
}