How to create this? Code ideas?

I'm creating something on a calculator but I want it to have a home screen sort of thing. Does anyone know what language/how Apple wrote like the iPhone home screen in or like if I will need to learn assembly.

Ooff… That would be a little tricky to do on a calculator. I'm assuming they wrote it in c or c++.

Calculators don't have the hardware to run a GUI.

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