27. Extract Bit Field from 16-bit Register

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

#define FIELD_POS
uint8_t extract_field(uint16_t reg) {

    uint8_t mask = 0x1F; //Mask for extraction
    uint8_t ans =0x00;

    ans |= ((reg >> 4) & mask);

    return ans;
}

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