Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>
#include <cstdint>
unsigned char extractNibble(unsigned char reg, int pos) {
    if(pos==0){
        unsigned char bit=reg&15;
        return bit;
    }
    else{
    unsigned char bit= reg&240;
    return bit>>4;}
}

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

Solving Approach