Why do some versions of toupper act strangely if given an upper-case letter?
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Answer Posted / Anupam Bharti
Different versions of C libraries and compilers may handle conversion between upper and lower case characters differently. Some older implementations of toupper() and tolower() have strange behaviors when given upper-case letters, as they don't convert these characters to themselves. Modern C standards ensure that toupper() converts any upper-case letter to itself, while tolower() converts it to its corresponding lower-case equivalent.
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