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 (pos == 0){
        return reg = (reg) & 0x0F ;
    }
    else if (pos == 1){
        return reg = ((reg) & 0xF0) >> 4 ;
    }
    else{
        return 0;
    }
}

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