Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    unsigned char res;
    if(pos == 0){
        res = reg & 0x0F; // the lowest bit here is zero, so no need to right shift
    }
    else{
        res = (reg >> 4) & 0x0F; // the lowest bit here is four, which translates to the number of bits that we need to right shift
    }
    return res;
}

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

Solving Approach