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What are the two specializations of I/O template classes in C++?

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What are the two specializations of I/O template classes in C++?

(a) 16-bit character and wide characters

(b) 8-bit character and wide characters

(c) 32-bit character and locale characters

(d) 64-bit characters and locale characters

I had been asked this question in unit test.

My doubt stems from Template Class topic in division Classes of Object Oriented Programming

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Best answer
Correct choice is (b) 8-bit character and wide characters

The best explanation: The I/O specialization is made with wide character and 8-bit characters. Wide characters are used to store the characters that might take more than 1 byte of space in memory or any size that is different from the one that the machine is using.

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