27. Extract Bit Field from 16-bit Register

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

uint8_t extract_field(uint16_t reg) {
    
    uint16_t new_reg = (reg >> 4U) & ((1U << 5U) - 1U);
    uint8_t val = uint8_t(new_reg);

    return val;
}

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