How do I define a constant in C++?

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!!! Special Math's classes !!!

To declare a constant member function, place the const keyword after the closing parenthesis of the argument list. The const keyword is required in both the declaration and the definition.
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solve Physics and math question in shortcut way

declare a constant member function, place the const keyword after the closing parenthesis of the argument list. The const keyword is required in both the declaration and the definition.
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