27. Extract Bit Field from 16-bit Register

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

#define MASK(lsb, msb)  ((~((~0x0) << ((msb - lsb) + 1))) << lsb)
uint8_t extract_field(uint16_t reg) {
    // Your logic here
    uint8_t new_val = 0;

    new_val = ((reg & MASK(4, 8)) >> 4);
    return new_val;
}

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