27. Extract Bit Field from 16-bit Register

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

uint8_t extract_field(uint16_t reg) {
    // Your logic here
    uint16_t mask = 0;
    for(int i=0;i<5;i++)
        mask |= 1 << i;
    reg >>= 4;
    return reg&mask;
}

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