Find Distance with LEDs and Ultrasonic sensor

1const int trigPin = 12;
2const int echoPin = 13;
3
4const int LED1  = A0;
5const int LED2 = A1;
6const int LED3 = A2;
7const int LED4 = A3;
8const  int LED5 = A4;
9const int LED6 = A5;
10const int LED7 = 2;
11
12int duration  = 0;
13int distance = 0;
14
15void setup() 
16{
17  pinMode(trigPin , OUTPUT);
18  pinMode(echoPin , INPUT);
19  
20  pinMode(LED1 , OUTPUT);
21  pinMode(LED2  , OUTPUT);
22  pinMode(LED3 , OUTPUT);
23  pinMode(LED4 , OUTPUT);
24  pinMode(LED5  , OUTPUT);
25  pinMode(LED6 , OUTPUT);
26  pinMode(LED7 , OUTPUT);
27  
28  Serial.begin(9600);
29
30}
31
32void  loop()
33{
34 digitalWrite(trigPin, LOW);
35  delayMicroseconds(2);
36  digitalWrite(trigPin,  HIGH);
37  delayMicroseconds(10);
38  digitalWrite(trigPin, LOW);  
39  duration  = pulseIn(echoPin, HIGH);
40  distance = duration/58.2;
41
42  if ( distance  <= 7 )
43  {
44    digitalWrite(LED1, HIGH);
45  }
46  else
47  {
48    digitalWrite(LED1,  LOW);
49  }
50  if ( distance <= 14 )
51  {
52    digitalWrite(LED2, HIGH);
53  }
54  else
55  {
56    digitalWrite(LED2, LOW);
57  }
58  if ( distance <=  21 )
59  {
60    digitalWrite(LED3, HIGH);
61  }
62  else
63  {
64    digitalWrite(LED3,  LOW);
65  }
66  if ( distance <= 28 )
67  {
68    digitalWrite(LED4, HIGH);
69  }
70  else
71  {
72    digitalWrite(LED4, LOW);
73  }
74  if ( distance <=  35 )
75  {
76    digitalWrite(LED5, HIGH);
77  }
78  else
79  {
80    digitalWrite(LED5,  LOW);
81  }
82  if ( distance <= 42 )
83  {
84    digitalWrite(LED6, HIGH);
85  }
86  else
87  {
88    digitalWrite(LED6, LOW);
89  }
90  if ( distance <=  49 )
91  {
92    digitalWrite(LED7, HIGH);
93  }
94  else
95  {
96    digitalWrite(LED7,  LOW);
97  }
98  delay(100);
99}