17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

#define LOWER 0x0F
#define UPPER 0xF0
unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    
    if(pos == 1)
    {
        reg &= UPPER;
        reg = reg>>4;
    }
    else
    {
        reg &= LOWER;
    }
    return reg;

}

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