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 ret;
    if(pos == 0){
        char temp = 0x0F;
        ret = reg & temp;
    }   
    else{
        char temp = 0xF0;
        ret = ((unsigned)reg & temp) >> 4;
    }

    return ret;
}

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