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

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len)
{
    uint32_t result = 0;
    for(int q=(pos+len-1);q>=pos;q--)
    {
      result = result | (reg &(1<<q));
    }
    result = result >> pos;
    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;
}