Reddit Arduino Servo Thing v1.0

/*
   Reddit Arduino Servo attempt
   July 2, 2019
   { wayward parentheses, mostly }
*/

#include <Servo.h>
Servo myservo; // create servo object to control a servo
const int trigPin = 2;
const int echoPin = 4;


// { void setup() // -- This curly brace should be after the parentheses, not at the start of the whole line.
void setup() { // -- corrected line
  // initialize serial communication:
  Serial.begin(9600);
  myservo.attach(9); // attaches the servo on pin 9 to the servo object
}

// { void loop() // -- This curly brace should be after the parentheses, not at the start of the whole line.
void loop() { // -- corrected line

  // and the distance result in centimeters:
  long duration, cm;
  pinMode(trigPin, OUTPUT);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2); // This isn't going to work like you think it will.
  // If I remember correctly, the smallest unit of time that the Uno and Mega chips can normally clock is 4 microseconds.
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(20);
  digitalWrite(trigPin, LOW);
  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);

  // convert the time into a distance

  cm = microsecondsToCentimeters(duration); // I do not know why it said that "cm was not declared in this scope"...???
  //                                           When I fixed the other curly braces errors, it no longer gave that message.

  // the condition for the distance


  if (cm > 7 && cm < 14) {
    myservo.write(140); // sets the servo position according to the scaled value
    delay(4000);
  }
  else if (cm < 8) {
    myservo.write(40); // sets the servo position according to the scaled value
    delay(100);
  }
  else {
    myservo.write(40); // sets the servo position according to the scaled value
    delay(100);
  }
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
  delay(100);
}


//{ long microsecondsToCentimeters(long microseconds) // -- This curly brace should be after the parentheses, not at the start of the whole line.
long microsecondsToCentimeters(long microseconds) { // -- corrected line

  // The speed of sound is 340 m/s or 29 microseconds per centimeter.
  // The ping travels out and back, so to find the distance of the
  // object we take half of the distance travelled.

  /*
    The error given for the line below ( sketch_jun29a:103:1: error: a function-definition is not allowed here before 'return' )
    may have been related to the incorrectly-placed curly brace at the beginning of the function.
    When I moved that curly brace to the proper location, this error message was no longer present.
  */
  return microseconds / 29 / 2; // If this doesn't give a correct answer, you may need to use parentheses to establish the order of operation.
}