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const, volatile & static

Three small keywords with outsized consequences: const for intent, volatile for hardware and ISR-shared data, static for lifetime and linkage, and why volatile is not atomic.

25 min read

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5 interview questions on this topic

Each one opens a full worked answer.

What does volatile do, and when must you use it?Does volatile make a variable atomic or thread-safe?What are the two meanings of static in C?Is volatile const a contradiction?Why might a static local variable be dangerous in embedded code?

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const, volatile & static | EmbeddedPrep.io