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Undefined behavior in C and C++

February 3, 2024 Working in C or C++ requires some awareness of undefined behavior: what it is, what its effects are, and how to avoid tripping over it. For simplicity, I will just talk about C, but everything in this article also applies to C++ except where otherwise noted. What is undefined behavior? What behaviors are undefined? Dereferencing a bad pointer Uninitialized data Signed integer overflow Bit shifting Aliasing Why? It's not about unusual hardware It is about optimization Except when...

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