17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    if ( 0 == pos)
    {
        reg = reg & 0x0F ;
        return reg ;
    }

    else if ( 1 == pos)
    {
        reg = reg & 0xF0 ;
        reg = reg >>4;
        return reg ;
    }

    else
    {
       
        return reg ;
    }

    
}

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