17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    unsigned char nibble;

    if (pos & 0x1) // pos equals 1
    {
        nibble = (reg  >> 0x04) & 0x0F; // shift upper nibble to lower nibble then bitwise and 

    }
    else
    {
        nibble = reg & 0x0F; // bitwise and lower nibble
    }
    
    return nibble;
}

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