X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/83e8dbfff2a6fdce785af58dbb13f007c4234cf2..5f6e02d64e3789115ea4327a045b8ad3c39b1808:/src/part08.rs?ds=inline diff --git a/src/part08.rs b/src/part08.rs index d6b6782..7b471b9 100644 --- a/src/part08.rs +++ b/src/part08.rs @@ -20,19 +20,19 @@ fn overflowing_add(a: u64, b: u64, carry: bool) -> (u64, bool) { //@ function (see [the documentation](http://doc.rust-lang.org/stable/std/primitive.u64.html#method.wrapping_add), //@ there are similar functions for other arithmetic operations). There are also similar functions //@ `checked_add` etc. to enforce the overflow check. - let sum = u64::wrapping_add(a, b); + let sum = a.wrapping_add(b); // If an overflow happened, then the sum will be smaller than *both* summands. Without an overflow, of course, it will be // at least as large as both of them. So, let's just pick one and check. if sum >= a { // The addition did not overflow.
// **Exercise 08.1**: Write the code to handle adding the carry in this case. - let sum_total = u64::wrapping_add(sum, if carry { 1 } else { 0 }); /*@@*/ - let had_overflow = sum_total < sum; /*@@*/ - (sum_total, had_overflow) /*@@*/ + let sum_total = sum.wrapping_add(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. - (sum + if carry { 1 } else { 0 }, true) /*@*/ + (sum + if carry { 1 } else { 0 }, true) /*@*/ } }