medium10 pts · first answer countsembedded-cpreprocessor

Why do { } while (0)

Why are multi-statement macros wrapped like this?

#define LED_PULSE() do { LED_ON(); delay_us(5); LED_OFF(); } while (0)

A.So the macro runs exactly twiceB.So the compiler inlines the delay callC.So it acts as one statement, even in if/elseD.So the macro can return a value

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Why do { } while (0)

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