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

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

#define EXTRACT_BITS(reg,pos,mask) reg>>pos & mask
uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    uint32_t mask = 0;
    for(int i=0;i<len;i++){
        mask |= 0b1<<i; 
    }
    return EXTRACT_BITS(reg,pos,mask);
    
}

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;
}