c$++$ Integers numCakes and dollars are read from input. A cake costs $9$ dollars.

If numCakes is less than $4,$ then output "numCakes is less than the required amount to purchase."

If numCakes is greater than or equal to $4,$ then assign variable totalCost with the product of numCakes and $9.$

If totalCost is less than or equal to dollars, then output "Cakes successfully purchased."

Otherwise, output "Not all cakes purchased."

If numCakes is greater than $20,$ then output "Restocking soon."

Otherwise, output "Item still in stock."

End each output with a newline.