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
    return reg >> pos << 32-len >> 32-len;
}

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

Eg. With 4-bit: reg = abcd, pos = 2, len = 1.

>> pos -> 00ab;

<< 4-len -> b000;

>> 4-len -> 000b;