27. Extract Bit Field from 16-bit Register

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

#define EXTRACT_POS         4
#define EXTRACT_SIZE        5
#define EXTARCT_MASK        (1 << EXTRACT_SIZE) - 1
static uint16_t temp = 0;

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

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