Create erc20 token that acts as fuel on ethereum chain

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Integers can be int or uint: Signed and unsigned integers of various sizes. If you are familiar with Computer Science theory or you know the difference between signed and unsigned integers in C language, everything is absolutely the same in Solidity. Signed on the other hand can be both negative and positive, but we will use only units in our contract.

Keywords uint8 to uint in steps of 8 unsigned of 8 up to bits and int8 to int We talked that we will store balances in some kind of array. Well, the better solution is to use hash tables, or in Solidity mappings. In that case, the contract that is creating the call would be the msg. The similarity ends here, though: The key data is not actually stored in a mapping, only its keccak hash used to look up the value.

Mappings are only allowed for state variables or as storage reference types in internal functions. It is possible to mark mappings public and have Solidity create a getter. Events The blockchain is a list of blocks which are fundamentally lists of transactions. Each transaction has an attached receipt which contains zero or more log entries. Log entries represent the result of events having fired from a smart contract. In the Solidity source code, to define an event, you mark it thus by preceding it with the event keyword similar in usage to the function keyword.

Y ou then call or fire the event in the body of whatever function you wish to cause to generate the event. I doubt there is a standard wording for it. You may fire events from any function using the emit keyword. To do that, we need to write code for all of our six mandatory functions. The purpose of this method is to determine the total number of tokens floating around the ecosystem. After all, the user should have the minimum amount of tokens required to do the transaction.

This is why, the ERC contract also includes the allowance function. The approve function also checks the transaction against the total supply of tokens to make sure that there are none missing or extra. In other words, it makes sure that counterfeiting is impossible. Arithmetic operations in Solidity wrap on overflow.

This can easily result in bugs, because programmers usually assume that an overflow raises an error, which is the standard behavior in high level programming languages. Safe Math restores this intuition by reverting the transaction when an operation overflows. All we need to do now is to copy this code above our contract, and then inherit it. This function lets the owner of the contract send a given amount of the token to another address just like a conventional cryptocurrency transaction.

We all have to pay some amount of money every month like clockwork. It could be your rent, the bills, etc. You can always set up an automatic payment system with your banks to take care of these payments. It helps you automate payment transfers to a specific account. You successfully developed your own ethereum token. The last step is deployment to the actual network.

Deploying Your Token To do this, we will need Metamask wallet. Metamask is extension that allows you to run Ethereum dApps right in your browser without running a full Ethereum node. Create a New Wallet in MetaMask When the extension is installed, click on the icon in the upper right corner of your browser to get started creating a wallet. You will see a 12 words seed phrase. You have now successfully created an account in MetaMask with a new wallet address!

You will notice that currently you have 0 ETH in your wallet. To deploy contract on Ethereum network one need some amount of Ether. We will not deploy our contract to main network as this is just demo. We will publish this contract to the test network. First you need some Ether, right? In smart contracts, the constructor is called when the contract is deployed to the network.

The msg. This argument is the address of the token owner to whom we want to return the balance of the token in the contract. So the method gets the balance by referencing the tokenOwner address from the balances. Then, a Transfer event is emitted. Finally, the Boolean true is returned. Then, we emit the Approval event and return true. The Transfer event is emitted and the boolean true is returned. Install the MetaMask extension on your desktop browser. Next, go to Remix and create a new.

Now, we can deploy our smart contract to the Ropsten test network. Go back to the Remix dashboard and click on the Ethereum logo in the dashboard. This will load a page where we can deploy and run transactions. Click on the dropdown and select Injected Web3. We should see 0. We need to enter the original amount of tokens that will be traded in our token. Enter this in the input beside the Deploy button.

Enter and click the Deploy button.