Answer 1

#define is propecced by the preprocessor before compilation where as consts are processed by the compiler.

Answer 2

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https://www.sololearn.com/discuss/1507749/?ref=app
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Answer 3

#define is used to define some values with a name (string), this defined string is known as Macro definition in C or C++; while const is a keyword used to make the value of an identifier unchangeable after it is given its value.