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

#include <stdio.h>
#include <stdint.h>
#define CHECK_BIT(reg, pos) ((reg) & (1 << pos))
#define SET_BIT(reg, pos) ((reg) |= (1 << pos))
uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    uint32_t ans = 0;
    int x = 0;
    for (int i = pos; i < pos + len; i++) {
        if (CHECK_BIT(reg, i)){
            SET_BIT(ans, x);
        }
        x++;
    }
    return ans;
    
}

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;
}