One of the key interest of C compared to more recent languages is that everything is explicit. With a finger you can follow the code as it runs and know exactly

One of the key interest of C compared to more recent languages is that everything is explicit. With a finger you can follow the code as it runs and know exactly what is going on and when exactly. This has not been true in many years. C appears to be such a language, but optimizing compilers have learned how to find and optimize undefined behavior in code that most C programmers don't realize is unsafe. As a result there can be a considerable gap between the code as clearly intended, and the code that will be generated. See https://blog.regehr.org/archives/213 https://blog.regehr.org/archives/213 for more on this. Including real world examples of things like validation checks being elided by the compiler, leading to real-world vulnerabilities in programs which clearly have checks to avoid exactly those vulnerabilities.