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 nibble;
    if(pos) // pos 1 means upper nibble
    {
        nibble = (reg & 0b11110000)>>4; 
    } 
    else{
        nibble = reg & 0b00001111;  // lower nibble
    }
    return nibble;
}

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

Solving Approach