Indeed, however every programmer no matter how good will make mistakes sometimes. It can be in 1%, 0.1%, 0.01% of LoC. Loosing attention can be so easy, it can

Indeed, however every programmer no matter how good will make mistakes sometimes. It can be in 1%, 0.1%, 0.01% of LoC. Loosing attention can be so easy, it can be a co-worker walking by, an important email/meeting happening while you were focused on a 'copy-pasting' step. Having a tool that is trained to spot this kind of human errors is good. It can be useful in any language, not only C++. Avoiding them in the first place and giving you advices on how to not do it again would be a nice thing compiler could provide. i.e: a[0] = b[0]; a[1] = b[1]; a[2] = b[0]; ^ warning: Are you sure you want to assign b[0] to a[2]. If not, consider rewriting your code with a for loop a[3] = b[3];