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 == 1){
            int mask1 = (1 << 4) -1;
        return (reg >> 4) & mask1;
    }
    else{
        int mask2 = (1 << 4) - 1 ;
        return (reg << 0) & mask2;
    }


    }
   

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