27. Extract Bit Field from 16-bit Register

#include <stdio.h>
#include <stdint.h>

uint8_t extract_field(uint16_t reg) {
    // Your logic here
    int bitmask=1<<4;
    for(int i=1;i<5;i++){
        bitmask+=1<<(4+i);
    }
    int val=(reg&bitmask)>>4;
    return val;
}

int main() {
    uint16_t reg;
    scanf("%hx", &reg);
    printf("%u", extract_field(reg));
    return 0;
}