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 mask = (1U << len) - 1;
    unsigned int temp;
    // int k = 0; 
    // for (int i = pos; i<= pos + len; i++){
        // temp = temp | (((((Mask) << (i)) & reg) >> (i)) << (k)); 
    // }
    temp = reg >> (pos) & mask;
    return temp;
}

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;
}