Write a $C++$ program that performs the following:

Prints on screen a selection menu as follow:

a$.$ Count characters, converts small character to capital.

b$.$ Series.

c$.$ Binary, Max Digits and Average Primes.

d$.$ Exit

If user presses a or $A,$ the following sub menu should be displayed

$1-$ Count characters:

$($Program should call a function that reads set of characters until $q$ is pressed. The function should count

the occurrence of each of these characters and $c.)$

$2-$ Small to Capital:

$($Program should call a function that prints all characters in the two cases $($small and capital$))$

$3-$ Return to the main menu.