17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    if(pos == 0)
    {
        unsigned char temp = ( reg & 0x0F );
        return temp;
    }
    else if (pos == 1)
    {
        unsigned char temp = (reg >> 0x04);
        return temp & 0x0F;
    }
}

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