17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    unsigned int value;

    // Write your code here
    if( pos == 0)
    {
        // lower nibble
        value = reg & 0x0F;
    }
    else if (pos =1)
    {
        value = ( reg >>4 )&0x0F;
    }
    return value;
}

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