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

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

(a) int

(b) long

(c) byte

(d) string

I got this question during an online interview.

This is a very interesting question from String Manipulation in portion Arduino Programming of Arduino

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Right answer is (d) string

Easy explanation: The substr() function is used to return a portion of a given string. It accepts 2 inputs as arguments; the lower and upper indexes. It can be used as “str.substr(a,b);” where a is the lower index and b is the upper index.

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