Write a program main $0$ that calls $($uses$)$ functions to do the following using $C++$ :

Write a function that prints a menu as follows"

$1-$ Find sum of digits

$2-$ last prime

If user presses $1$: the program should compute the sum of the digits of an integer using function and check if the summation is prime number or not.

Example: Input any number: $255$

The sum of the digits of the number $255$ is ${12}_{?},$ Is not a prime number

If user presses $2$ : The program should find the last prime number occur before the entered number.

Example:

Input a number to find the last prime number occurs before the number: $5047$ is the last prime number before $50$