27. Extract Bit Field from 16-bit Register

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

uint8_t extract_field(uint16_t reg) {
    // Your logic here
    uint32_t mask = ((1 << (8 - 4 + 1)) - 1) << 4;

    uint8_t extracted = (reg & mask) >> 4;

    return extracted;
}

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