Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
   int mask1=0x0F;
   int mask2=0xF0;
   if(pos==0){
    reg&=mask1;
    
   }else{
   reg&=mask2;   
    reg=reg>>4;

   }
    return reg;
}

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