Possible help needed on creating a progra?

I am practicing my programming and I want to create a program that will display this:

1. Add
2. Delete
3. Sort
4. Find
5. Display All
6. Exit

It needs to contain one class that has all the PLANETS in it and so that you can Add or Delete a PLANET.
The PLANETS should have the surface area and density of each PLANET where g is the acceleration due to gravity.

Maybe if you help me out I will understand a little bit more how to create something similar to this. It would be much appreciated :)
What's the problem? Create two classes according to the requirements. Use a vector to store the planets.
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