17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
     unsigned char temp;
     if(pos==0){
        temp = reg&(0x0f);
     }
     else{
        temp=reg>>4;
     }
     return temp;
}

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