17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

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

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