17. Extract the Nibble from an 8-bit Register

#include <stdio.h>
#include <stdint.h>

unsigned char extractNibble(unsigned char reg, int pos) 
{
    if(pos == 1)
    {
        reg = reg >> 4;

        return (reg & 0xF);
    }

    else
    {
        return (reg & 0xF);
    }
}

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