Web Reference: The isupper() function returns a non-zero value (equivalent to boolean true) if a character is an uppercase letter. The isupper() function is defined in the header file. Function isupper () takes a single argument in the form of an integer and returns a value of type int. Even though, isupper () takes integer as an argument, character is passed to the function. Internally, the character is converted to its ASCII for the check. It is defined in header file. Argument is an uppercase alphabet. The isupper() function in C checks whether a given character is an uppercase letter. It is particularly useful for validating and processing textual data, ensuring that characters conform to expected casing rules.
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