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 res=0;

    reg>>=pos;

    reg<<=(32-len);

    reg>>=(32-len);

    return reg; 

}

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;

}

Yeah I think case 5 is wrong.  I think the answer should be 8

Case 1 and case 5 both have the same position and length specification. They solution behaves differently. What didn't I understand about the question?