17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    int mask;
    if(pos == 0){
        mask =0x0f;
        return reg & mask;
    }
    else{
        mask = 0xf0;
        reg &= mask;
        reg = reg >> 4;
        return reg;
    }
    return reg;
}

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