17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    
      if(pos==0)
      {
        return (reg & 0x0F); //Lower
      }
      else
      {
        return (reg & 0xF0)>>4;  //upper
      }
}

int main() {
    unsigned char reg;
    int pos;
    scanf("%hhu %d", &reg, &pos);
    printf("%d", extractNibble(reg, pos));
    return 0;
}