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)
   { return (reg>>4);}
    else 
    { return reg & 0x0f;}
     
}

int main() {
    unsigned char reg;// 8bit 1 byte 
    int pos;
    scanf("%hhu %d", &reg, &pos);
    printf("%hhu", extractNibble(reg, pos));
    return 0;
}