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;}
   else
        {return (reg>>4)&0x0F;} // Write your code here
}

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

if(pos==0)
     {return reg&0x0F;}
   else
        {return (reg>>4)&0x0F;}