need help with this c$++$ code!

Define a class called Employee with the following properties and methods:

$$ Properties: name $($string$),$ employee ID $($integer$),$ and salary $($double$)$

$$ Methods:

Constructor: Takes parameters to initialize the name, employee ID$,$ and salary.

DisplayInfo$()$: Displays the name, employee ID$,$ and salary of the employee.

$$ Define a derived class called Manager, which inherits from the Employee class. The Manager class should have an additional property called department $($string$).$

$$ Create instances of these classes $($objects$)$ using constructors and demonstrate the use of their methods.