17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    char treg = 0;
    if (pos == 0)
    {
        treg = reg&0x0F;
    }
    else 
    {
        treg = (reg&0xF0)>>4;
    }
    return treg;
}   

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