17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
   char ch;
    switch(pos)
    {
        case 0: ch=(reg&0x0f);
                break;
        case 1: ch=((reg>>4)&(0x0f));
                break;
    }
    
    return ch;
}

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