A smart contract that uses view, pure, and payable functions.

function.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

contract Function {
    uint public a = 5;

    // View function
    function multiplyNumbers(uint b) public view returns (uint) {
        return a * b;
    }

    // Pure function
    function multiply(uint x, uint y) public pure returns (uint) {
        return x * y;
    }

    // Payable function
    function deposit () public payable {}   
}