27. Extract Bit Field from 16-bit Register

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

#define FIELD_SHIFT 4 
#define FIELD_WIDTH 5
#define FIELD_MASK (((1 << FIELD_WIDTH) - 1) << FIELD_SHIFT)

uint8_t extract_field(uint16_t reg) {
    // Your logic here
    uint16_t val = 0;
    val = (reg & FIELD_MASK) >> FIELD_SHIFT;
    return val;
}

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