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What is the difference between unsigned int length() and unsigned int size()?

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What is the difference between unsigned int length() and unsigned int size()?

(a) Returns a different value

(b) They are same

(c) Returns a different value but they are same

(d) Returns a length

I have been asked this question in homework.

This interesting question is from Basic String topic in division Strings, Streams & Numerics in C++ of C++

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Correct answer is (b) They are same

To explain I would say: Both of them will return the length of strings in the same notations.

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