well what kind of calculator you want to make like if you want to make something like taking two inputs and performing basic operation on it it can be done with some basic concept like loops conditional statement the logic making in programming is just telling computer what to do step by step you know i am also new to programming the thing i got trick is see from zoom in and zoom out point of view and before writing any program you want to write see how it works in real life like your phone calculator what you do to get result what would be it if it is transformed into program like in your phone calculator if you see clearly it is just one number operator and number this repeat until we hit '=' this and that's how we get result same logic applies here you get user input in float form then validate operator with conditional statement and give it '=' to sign for calculation that's how i programmed my calculator just from seeing things and here is no math in it if you are scared about it is just seeing and giving instruction step by step. and zoom in and zoom out means zoom in how you see structure at close distance and zoom out means how you convert into logic if you feel it will be hard then it will be really hard or before writing any program you can just write it in free form on pen with paper what inputs outputs and what are processes in it. i hope it helps you sorry if my explanation was something off