Homework_3

VolcanoCoin.sol

// SPDX-License-Identifier: UNLICENSED 
pragma solidity ^0.8.7; // Homework said ^0.8.0, but he also said choose latest available to us, so going with ^0.8.7

contract VolcanoCoin {
    // initialize owner in constructor
    constructor() { owner=msg.sender; }
    
    // set variables for totalSupply and ownerAddress
    uint totalSupply = 10000;
    address owner;
    
    // create modifier to be used to scope visibility when changing contract
    modifier onlyOwner {
        if (msg.sender==owner) {
            _;
        }
    }
    
    // simple getter to return total supply (can also do this inline with `public` keyword on variable instantiation
    function getTotalSupply() public view returns(uint) { return totalSupply; }
    
    // broadcast supply change to network
    event TotalSupplyUpdated(uint);
    
    // owner permissable function to allow the increase in supply
    function increaseSupply(uint _totalSupply) public onlyOwner {
        _totalSupply = _totalSupply + 1000;
        emit TotalSupplyUpdated(_totalSupply);
    }
}