void setup() {

  Serial.begin(9600);  

}

​

void loop() {

  if (Serial.available() > 0) {

  float number = Serial.parseFloat();

  float squareRootValue = sqrt(number);

  Serial.print("Square Root of ");

  Serial.print(number);

  Serial.print(" is: ");

  Serial.println(squareRootValue);

​

  }

}