c++codeblocks
Why are some keywords colored green in CodeBlocks IDE(C++)?
Some keywords are colored green automatically. What do those words mean? Are those keywords reserved for C++? Can I use those words as program variables?
Solution
sizeof is an operator. You can't use it as an identifier.
size is a function in std::, and also a member of many classes in std::. You should use it as an identifier, if you are writing a Container type. It's fine to use it as an identifier elsewhere.
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