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
   reg = ((reg >> pos) & ((1 << len) - 1));
//   uint8_t temp =0;
//   uint32_t reg1=0;
//   while(len){
//     temp = ((reg >> pos++) & 1);
//     reg1 = ((reg1 << 1) | temp);
//     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;
}

Solving Approach