if sum >= a {
// The addition did not overflow. <br/>
// **Exercise 08.1**: Write the code to handle adding the carry in this case.
- unimplemented!()
+ let sum_total = u64::wrapping_add(sum, if carry { 1 } else { 0 }); /*@@*/
+ let had_overflow = sum_total < sum; /*@@*/
+ (sum_total, had_overflow) /*@@*/
} else {
// Otherwise, the addition *did* overflow. It is impossible for the addition of the carry
// to overflow again, as we are just adding 0 or 1.
carry = new_carry; /*@*/
}
// **Exercise 08.2**: Handle the final `carry`, and return the sum.
- unimplemented!()
+ if carry { /*@@*/
+ result_vec.push(1); /*@@*/
+ } /*@@*/
+ BigInt { data: result_vec } /*@@*/
}
}