$($a$)$ Sketch a flowchart $($Visio diagram$)$ for Matlab code that repeatedly prompts a user to enter a prime number until the user enters a prime number. Use a while loop and an if statement.

$($b$)$ Write a Matlab code snippet for the problem outlined in $($a$)$ above. Your code should output appropriate messages when the number entered is$,$ and is not, a prime number. Hint: Use a while loop and Matlab's input $(),$ disp $()/$ fprintf $()$ and isprime $()$ functions.