19. Extract a Bit Field from a 32-bit Register

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

uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    uint32_t result = 0;
    size_t k = 0;

    for (size_t i = pos; i < pos + len; i++) {
        if (reg & (1U << i)) {
            result |= (1U << k);
        }
        k++;
    }
    return result;
}

int main() {
    uint32_t reg;
    uint8_t pos, len;
    scanf("%u %hhu %hhu", &reg, &pos, &len);
    printf("%u", extract_field(reg, pos, len));
    return 0;
}