Help me in how to build a simple calc

Question

Help me

Answer 1

I don't get your second point

Answer 2

a little tips to get an answer if you're asking about coding

1. work on the code first, try it yourself. then put the link in the question
2. be more specific on your question, the question like "help me build this or that" are way too broad to answer.

Answer 3

its too hard to explain the answer, there's many possible way to code a single program and could be different each coders.

and if, we want to answer based on how we code, there is so much step needed to describe.
the best answer that people will usually give is, just straight code the entire thing and told you to learn from it
or just giving a general steps to create the program.