islower() and isupper function is in header file ctype.h . But when i run my program , it gave right result even if i didn’t add the header file. why so?
Islower() and isupper() function
ctype is header file of the C Standard Library.Yes for islower() and isupper function you must include this header. Even without including the header file, it is giving the result. I think that including this is not necessary in c++ as all function that are under this header file are working without it.
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