17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    switch (pos) {
        case 1:
        reg &= 0b11110000;
        reg = reg >> 4;
        break;
        case 0:
        reg &= 0b00001111; 
        break;
    }
  return reg;
}

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