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isalpha() function is used to detect characters both in uppercase and lowercase.

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isalpha() function is used to detect characters both in uppercase and lowercase.

(a) true

(b) false

I had been asked this question in an online interview.

This question is from Character Handling in chapter String Operations in C of C
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Correct option is (a) true

Explanation: isalpha() function is used to test for letters in the local alphabet. For the locale, the local alphabet consists of  26 English letters, in each of two cases.
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