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What is the return type of the delayMicroseconds() function?

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What is the return type of the delayMicroseconds() function?

(a) Unsigned Int

(b) Signed Int

(c) Unsigned Long

(d) Signed Long

This question was addressed to me by my school principal while I was bunking the class.

Asked question is from Time Functions in section Arduino Programming of Arduino

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Correct option is (a) Unsigned Int

The best explanation: The delayMicroseconds() function delays or pauses program execution for a certain amount of time. The return type here is unsigned int, which means basically a number of the int datatype without any plus or minus signs. This number here is denoted by microseconds.

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