Due to the shared history of C and C++, both languages are closely related. Because neither of them is a subset of the other, you have to know a few rules to mix them.
This section in the C++ Core Guidelines consists of three rules. These three rules cover the typical issues encountered when dealing with legacy code.
Without further ado, here is the reason the C++ Core Guidelines prefer C++: “C++ provides better type checking and more notational support [than C]. It provides better support for high-level programming and often generates faster code.”
CPL.2 ...
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