Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    // checking if user is asking for lower nibble
    // creating a 4-bit mask
    unsigned char mask = 0xF; // mask = 0000 1111
    if ( pos == 0 )
    {
        // for ex, user inputs 0000 0001 = 1, now we will have to extract lower nibble 0001
        // we can make use of AND operation so input variable will be anded with mask and whatever matches with 1 will
        // return 1 else will return 0
        return reg & mask;
    }
    else
    {
        // ( value to be shifted(the input value) >> position(4-bit to the right) )
        return ( reg >> 4 ) & mask;
    }
}

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

Solving Approach