digitalWrite Code explanation

Projects General Guidance
1

I'm looking for a code to alert via buzzer if an ultrasonic sensor senses any objects within 80cm, Then I found code in the internet as shown below:

if (distance < 20)
digitalWrite(buzzer, (20 - distance)*10

I didnt understand the code inside the digitalWrite which says (20 - distance)*10

Please could anyone help to tell me what does that code does

Thanks.

2

Basically the closer you get, the quitter the alarm gets, but it should not be using digitalWrite. Instead it should be using analogWrite and a pin that supports PWM.

3

Thank you

4 
digitalWrite(buzzer, (20 - distance)*10

The closing ) should be to the right of the 10 (or the *10 should be deleted)

...R

5

That code is total tosh.
It will not compile and has no terminating ;
With digital write you can only write high or low to a pin.
the code should / could be:-

if (distance < 20)  // if the distance is less than 20
digitalWrite(buzzer, HIGH); // then turn on the buzzer