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
    int result=0;
    int result2 =0;
    reg = reg>>pos;
    for (int i = 1; i <= len; i++){
        int bit = reg & 1;
        result = result <<1;
        result = result|bit;
        reg = reg >>1;
    }
    while (result){
        int bit = result & 1;
        result2 = result2 <<1;
        result2 = result2 |bit;
        result = result >> 1;
    }
    return result2;
}

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;
}