17. Extract the Nibble from an 8-bit Register

#include <stdio.h>


unsigned char extractNibble(unsigned char reg, int pos) {
    int value;
    if(pos == 0){
        value = reg & 0x0F;//lower half
    }
    else{
        value = (reg & 0xF0)>>4 ; //upper half
       
    }
    return value;
}

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