27. Extract Bit Field from 16-bit Register

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

uint8_t extract_field(uint16_t reg) {
    uint16_t Mask = 0x1F;
    uint16_t AdditionalReg = 0x0000;
    AdditionalReg = (reg >> 4) & Mask;

    return AdditionalReg;
}

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