19. Extract a Bit Field from a 32-bit Register

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

uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    uint32_t res =0 , pos1=0;
    for(pos ; pos<32 ; pos++)
    {
        if(len>0)
        {
            uint32_t bit = (reg>>pos)&1;
            res |=bit<<pos1;
            pos1++;
            len--;
        }
    }
    return res;
}

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;
}