Matrix - 3-Axis Digital Compass/zh

int main(int argc, char ** argv) {

   int devFD;
   double angle;
   int i2cDev = 0;
   
   if (boardInit() < 0)
       printf("Fail to init board\n");
   
   if (argc == 2)
       i2cDev = atoi(argv[1]);
   
   if ((devFD = hmc5883Init(i2cDev)) == -1) {
       printf("Fail to init hmc5883\n");
       return -1;
   }

   if ((angle = hmc5883Read(devFD)) == -1) {
       printf("Fail to read hmc5883\n");
       hmc5883DeInit(devFD);
       return -1;
   }
   printf("The angle is %.1f\n", angle);
   printf("You are heading ");
   if((angle < 22.5) || (angle > 337.5 )) {           
       printf("South\n");
   }
   else if((angle > 22.5) && (angle < 67.5 )) {
       printf("South-West\n");
   }
   else if((angle > 67.5) && (angle < 112.5 )) {  
       printf("West\n");
   }
   else if((angle > 112.5) && (angle < 157.5 )) {  
       printf("North-West\n");
   }
   else if((angle > 157.5) && (angle < 202.5 )) {   
       printf("North\n");
   }
   else if((angle > 202.5) && (angle < 247.5 )) {  
       printf("NorthEast\n");
   }
   else if((angle > 247.5) && (angle < 292.5 )) {  
       printf("East\n");
   }
   else if((angle > 292.5) && (angle < 337.5 )) {   
       printf("SouthEast\n");
   }
   hmc5883DeInit(devFD);
   return 0;

}