#include <stdio.h>

int main()
{
   unsigned char a = 073;

   unsigned char m1 = 0x00;

   unsigned char r1 = a & m1;

   unsigned char m2 = 0374;

   unsigned char r2 = a & m2;

   printf("Num: %d\n", a);
   printf("Mask1: %d   Result1: %d\n", m1, r1);
   printf("Mask2: %d   Result2: %d\n", m2, r2);

   return 0;
}