Extract a Bit Field from a 32-bit Register

Code

#include <stdio.h>
#include <stdint.h>

uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    // int8_t count = (pos+len-1);
    // uint32_t result = 0;
    // while(count >= pos)
    // {
    //     result <<= 1;
    //     result |= ((reg &(1<<count)) >>count);
    //     count--;
    // }
    // return result;
        int8_t count = pos;
    uint32_t result = 0;
    uint8_t n = 0;
    while(count < (pos+len))
    {
        result |= (((reg &(1<<count)) >>count)* (1<<n));
        count++;
        n++;
    }
    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;
}

Solving Approach