C++ Question

Background The following functions defined in the library header file are used to manipulate or test individual characters toupper () tolower () isupper () islower () isalpha () isdigit ) Convert character to uppercase if alphabet Convert character to lowercase if alphabet Check whether character is alphabet u Check whether character is alphabet lowercase Check whether character is alphabet Check whether character is a digit ase Instructions Write a program named casing.cpp that defines five user-defined functions string titleCase (string input) o Returns a modified version of input where each word starts with an uppercase letter o Returms a modified version of input which alternates between upper- and lowercase o Returms a modified version of input that capitalizes each letter o Returns a modified version of input that only contains alphabet letters string alterCase (string input) string allc aps (String input ) string alphabetonly (string input) o HINT: use the .erase ) string member function bool yesorNo () Prompts the user for a "yes" or "no" answer, accepting any upper- and lowercase combination of each word Uses a loop to validate the input o o Implement a main function that tests each function, as shown in the sample output