Project 2 - Measuring the distance of an object using ultrasonic sensor and also smoothen the sensor data using moving average filter

Code:

float sum;
float average; // initializing varibles//
int a[4];
void setup()
{

Serial.begin(9600);

}

void loop()
{

for (int i=0;i<5;i++)
{

pinMode(4,OUTPUT); //pinmode setup//
digitalWrite(4,LOW); // sensor putting off condition//
delay(1);

digitalWrite(4,HIGH); //sensor putting on condition//
delay(1);

digitalWrite(4,LOW);

pinMode(4,INPUT);

a[i] =pulseIn(4,HIGH); //relesing the pulses//
Serial.println (a[i]);
}

for (int i=0;i<5;i++)
{
sum=a[i]+sum;

}

Serial.println(sum);

average=(sum/5); // average the values//

delay(10);
int inches= t(average); //calculating the distance//
int centimeters= c(average);
Serial.println(inches);
delay(1000);
Serial.println(centimeters);
delay(1000);

}

int t(int time)
{
time= (time/74); // calculating time//

return time/2;

}

int c(int time)
{
time= (time/29);

return time/2;

}