17. Extract the Nibble from an 8-bit Register

#include <stdio.h>
#include <stdint.h>
unsigned char extractNibble(unsigned char reg, int pos) {
    uint8_t result;
    if(pos==0)
    result = reg & 0X0F;
    else
    result = (reg>>4) & 0X0F;
    return result;
}
int main() {
    unsigned char reg;
    int pos;
    scanf("%hhu %d", &reg, &pos);
    printf("%d", extractNibble(reg, pos));
    return 0;
}