Write a value-returning function, isVowel, that returns the value true if a given character is a vowel and otherwise returns false. What is the data type of the value-returning function isVowel? What...

Extracted text: Write a value-returning function, isVowel, that returns the value true if a given character is a vowel and otherwise returns false. What is the data type of the value-returning function isVowel? What are the formal parameters to the function? What are the data types on the formal parameters? What passing technique is used on those parameters? Write the definition for the isVowel function in the space below.