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 ans = 0x0000;
    reg = reg >> pos;
    for(uint8_t i = 0; i < len; i++) {
        uint32_t bit = (reg) & (1U << 0);
        ans = ans | (bit << i);
        reg = reg >> 1;
    }
    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;
}