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comp.lang.c FAQ list · Question 10.5b

Q: What's the difference between

	const MAXSIZE = 100;
	#define MAXSIZE 100

A: A preprocessor #define gives you a true compile-time constant. In C, const gives you a run-time object which you're not supposed to try to modify; ``const'' really means ``readonly''. See also the question 11.8. (But in C++, const is closer to #define.)

Additional links: longer explanation

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