十岁孩子做了个数字时钟送妈妈，顺便把作业交了

#include       /* These are libraries */
#include 
#include 
#include 
// turns a pin on or off
void nixiePin (int p, int v){
 if (p != -1) {
   digitalWrite (p, v);
 }
}
// converts to binary and sends values to 4 pins
void nixiePins (int p1, int p2, int p4, int p8, int v){

 nixiePin (p1,v&1);
 nixiePin (p2,v&2);
 nixiePin (p4,v&4);
 nixiePin (p8,v&8);
}
// splits the time into digits
void nixieTime (int h,int m, int s) {

 nixiePins ( 1, -1, -1, -1, h/10);  /* quotient of hour / 10  */
 nixiePins ( 2,  3,  4,  5, h%10);  /* remainder of hour / 10 */
 nixiePins ( 6,  7, 21, -1, m/10);  /* quotient of minute / 10*/
 nixiePins (22, 23, 24, 25, m%10);  /* remainder or min / 10  */
}
// makue sure all the digits work
void testClock (void){
 int i;
 for (i=1; i<=12; i  ) {
    nixieTime (i,0,0);
    delay (250);
 }
 for (i=1; i<=59; i  ) {
    nixieTime (12,i,i);
    delay (250);
 }
}
// set up the pins we will use
void initPin (int p) {
 pinMode (p, OUTPUT);
 digitalWrite (p, LOW);
}
// this is the main part of the program
int main (void) {           
 time_t now;         /* its a variable that holds time info */
 struct tm *ntm;     /* it is a variable */
 int i;
 
 wiringPiSetup ();    /* set up pins 0-7 and 21-29 to use  */
 for (i=0; i <=7;i  ) {
   initPin (i);
 }
 for (i=21; i <=29;i  ) { 
   initPin (i); 
 } 
 digitalWrite (0, HIGH);            /* turn on high voltage power */ 
 testClock ();                      /* test all the digits */ 
 while (1) {                       /*starts and infinite loop */ 
   now=time (NULL);                 /* ask the computer for the time */ 
   ntm=localtime (&now);            /* it formats the time */ 
   if (ntm->tm_hour > 12) {        /* if hour is more than 12 - 12 */
     ntm->tm_hour = ntm->tm_hour-12;
   }
   /* it tells it to write that number to the nixie tubes*/
   nixieTime (ntm->tm_hour,ntm->tm_min,ntm->tm_sec);   
   delay (1000);   /* wait for 1 second */
 }
 return(0);
}