X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/e73ddf5e1d4768cb86fba3eb583f4fec0286acff..9f6c55ebcab2e1d3073e8bb6c8c910d0116efee4:/src/part08.rs
diff --git a/src/part08.rs b/src/part08.rs
index feb2abc..2867a58 100644
--- a/src/part08.rs
+++ b/src/part08.rs
@@ -26,11 +26,13 @@ fn overflowing_add(a: u64, b: u64, carry: bool) -> (u64, bool) {
if sum >= a {
// The addition did not overflow.
// **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.
- (sum + if carry { 1 } else { 0 }, true) /*@*/
+ (sum + if carry { 1 } else { 0 }, true) /*@*/
}
}
@@ -82,7 +84,10 @@ impl ops::Add for BigInt {
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 } /*@@*/
}
}