17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    unsigned int a;
    if(pos==0)
    {
      a=reg & 0x0F;
      return a;
    }
    else
    {
        a=(reg >> 4) & 0x0F;
        return a;
    }
}

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