Use C++, write the following functions. Each of these functions should have a single parameter -- accepting a c-style string as an argument. The function should only do what is specified (note that...

Use C++,  write the following functions. Each of these functions should have a single parameter -- accepting a c-style string as an argument. The function should only do what is specified (note that none of these functions do any output to the screen). Your functions should use const in the prototype wherever it is appropriate:

Write a function that counts and returns the number of vowels in the string. (For the purposes of this exercise, we are talking about the standard 5 vowels -- A, E, I, O, U).
Write a function that counts and returns the number of consonants in the string.
Write a function that converts the string to all lowercase.
Write a function that converts the string to all uppercase.

Write the main function that offers a menu and allows the user to test the functions you have implemented.