Smart Calculator

Let’s say you’re building a simple calculator in Solidity. You want it to handle basic math — addition, subtraction, multiplication, and division.

Things are smooth until a user says:

“Hey, can this also calculate square roots? Or raise numbers to powers?”

You could throw everything into one huge contract...

But there's a better approach: split responsibilities.

One contract will handle the basics.

Another contract will handle advanced stuff — like powers and square roots.

Then, we’ll make them talk to each other.

Let’s build this step by step.

The Plan: Two Contracts, Two Files

We’re going to build two smart contracts that work together:

Calculator.sol – This will be our main calculator. It handles basic math like addition, subtraction, multiplication, and division. When it needs help with more advanced math, it delegates the task.
ScientificCalculator.sol – This contract is where we’ll put the advanced stuff — like exponentiation (powers) and square root calculations.

Each contract will live in its own separate file, but they’ll be connected.

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Here is the complete code 👇🏼 1️⃣ Calculator.sol :

2️⃣ ScientificCalculator.sol :

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In order to call functions from ScientificCalculator inside the Calculator contract, we’ll import it and store its deployed address.

⚠️ Important: Keep both files in the same directory, so the import works without issues.