Question
Develop change_case() Function 1. Write a function that accepts a char input variable cIn and returns a char value according to the following: a. If
Develop change_case() Function 1. Write a function that accepts a char input variable cIn and returns a char value according to the following: a. If the input value is a lower-case letter (a, b, ..., z), return the corresponding upper-case value. b. If the input value is an upper-case letter (A, B, ..., Z), return the corresponding lower-case value. c. If the input value is not a letter, print the message THAT IS NOT A LETTER! and return the input value unchanged. Use the following function prototype: char change_case(char cIn); 2. Use the main program main change_case.c to test your function change_case(). It uses a do-while loop that allows the user to continuously enter one character and test the function. It incorporates prompting of the user and prints messages. When the user enters the ESC key the program exits.
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