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
    uint32_t val =0, bit = 0;
#if 0
    for(uint8_t index = pos + len -1; index > pos -1; index--)
    {
         val <<= 1;
        if(0 < (reg & (1 << index)))
        {
            val |= 0x01; 
        }
    }
#else
    for(uint8_t index = pos, index2 = 0 ; index < pos + len; index++, index2++)
    {
        if(0 < (reg & (1 << index)))
        {
            val |= (0x01 << index2);  
        }
    }

#endif
    return val;
}

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