Arduino UNO Rev3 ultrasonic distance measurement

1int trigPin = 9;
2int echoPin = 10;
3int led = 7;
4
5
6void   setup() {
7  Serial.begin(9600); 
8   pinMode(led, OUTPUT);
9   pinMode(trigPin,   OUTPUT);
10  pinMode(echoPin, INPUT);
11  // put your setup code here, to run   once:
12
13}
14
15void loop() {
16  long duration, distance;
17  digitalWrite(trigPin,HIGH);
18   delayMicroseconds(1000);
19  digitalWrite(trigPin, LOW);
20  duration=pulseIn(echoPin,   HIGH);
21  distance =(duration/2)/29.1;
22  Serial.print(distance);
23  Serial.println("CM");
24   delay(10);
25 
26 if((distance<=10)) 
27  {
28    digitalWrite(led, HIGH);
29}
30    else if(distance>10)
31 {
32     digitalWrite(led, LOW);
33   }
34}

1int trigPin = 9;
2int echoPin = 10;
3int led = 7;
4
5
6void  setup() {
7  Serial.begin(9600); 
8   pinMode(led, OUTPUT);
9   pinMode(trigPin,  OUTPUT);
10  pinMode(echoPin, INPUT);
11  // put your setup code here, to run  once:
12
13}
14
15void loop() {
16  long duration, distance;
17  digitalWrite(trigPin,HIGH);
18  delayMicroseconds(1000);
19  digitalWrite(trigPin, LOW);
20  duration=pulseIn(echoPin,  HIGH);
21  distance =(duration/2)/29.1;
22  Serial.print(distance);
23  Serial.println("CM");
24  delay(10);
25 
26 if((distance<=10)) 
27  {
28    digitalWrite(led, HIGH);
29}
30   else if(distance>10)
31 {
32     digitalWrite(led, LOW);
33   }
34}