POP-XT with HC-SR04 Show CM and Inch on GLCD

#include <popxt.h>
#define CM 1      //Centimeter
#define INC 0     //Inch
#define TP 4      //Trig_pin
#define EP 6      //Echo_pin
long Distance(long time, int flag)
{
          long distacne;
          if(flag)
             distacne = (time /29) / 2  ;     // Distance_CM  = ((Duration of high level)*(Sonic :340m/s))/2
                                            // = ((Duration of high level)*(Sonic :0.034 cm/us))/2
                                            // = ((Duration of high level)/(Sonic :29.4 cm/us))/2
         else
              distacne = (time / 74) / 2;      // INC
          return distacne;
}

long TP_init()
{
         digitalWrite(TP, LOW);
         delayMicroseconds(2);
         digitalWrite(TP, HIGH);                 // pull the Trig pin to high level for more than 10us impulse
         delayMicroseconds(10);
         digitalWrite(TP, LOW);
         long microseconds = pulseIn(EP,HIGH);   // waits for the pin to go HIGH, and returns the length of the pulse in microseconds
         return microseconds;                    // return microseconds
}
void setup()
{
             pinMode(TP,OUTPUT);       // set TP output pin for trigger
             pinMode(EP,INPUT);        // set EP input pin for echo
             glcdMode(3);
             setTextSize(2);
             glcd(0,0,"Hello");
}
void loop()
{
             long microseconds = TP_init();   // trigger and receive
             glcd(1,1,"mSec= %d   ",microseconds);
             long distacne_cm = Distance(microseconds, CM); // Calculating the distance
             glcd(2,1,"Dist= %d CM  ",distacne_cm);
             delay(300);
}