Extract a Bit Field from a 32-bit Register

Code

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

// version that works for lengths up to the type's width (excluding full width)
#define BIT_MASK(length) ((1U << (length)) - 1)

uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    
    uint32_t result = (reg >> pos) & BIT_MASK(len);


    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