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 extract1 = 0;
    uint32_t extract2 = 0;
    for(int i=0; i<32 ; i++){
        if((i >= pos) && (i<(pos+len))){
            if(reg & (1<<i)){
                extract1 |= (1<<i);
            }
        }
    }
    extract2 = (extract1>>pos);
    return extract2;
}

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;
}