17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) 
{
    unsigned char x;
    int decimal_value=0;
    int dummy;
    if(pos==0)//lower nibble
    {

       reg= reg &0x0f;
    }
    else        //higher nibble
    {
        reg=(reg&0xf0)>>4;
    }
    decimal_value=reg;
    // Write your code here
    return decimal_value;
}

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