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Bill Buchanan
2022-03-29 06:13:29 +01:00
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# Lab 8: Blockchain and Cryptocurrencies
At the end of this lab, remember to stop your Blockchain (Control-C from the console that is running Geth), and shut down your VM. You may also want to use “rm -r mynapier” in order to delete your blockchain.
Aim: To provide a foundation in understanding in Bitcoin and Blockchain.
## Activities
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## Creating a Smart Contract in Ethereum
So, let’s write a bit of code that does some simple maths. In the following we will implement sqrt(), sqr(), mul(), sub(), and add():
```
```solidity
pragma solidity ^0.8.0;
contract mymath {function sqrt(uint x) public view returns (uint y) {
uint z = (x + 1) / 2;
@@ -204,19 +202,16 @@ Note:You can get Ether for our wallet [here](https://faucet.metamask.io/)
* allowance. This function checks if a user has enough funds in their account for a transaction.
<p>There are also a number of options:</p>
There are also a number of options:
* Token Name. This is the name that the token will be defined as.
* Symbol. This is the symbol that the token will use.
* Decimal. This is the number of decimal places to be used for any transactions.
So, let's create a token named "ENUToken", and use the tutorial sample from [here](https://github.com/bitfwdcommunity/Issue-your-own-ERC20-token/blob/master/contracts/erc20_tutorial.sol). First, we open up remix.ethereum, and enter the following Solidy contract:
<p>
So, let's create a token named "ENUToken", and use the tutorial sample from [here](https://github.com/bitfwdcommunity/Issue-your-own-ERC20-token/blob/master/contracts/erc20_tutorial.sol). First, we open up remix.ethereum, and enter the following Solidy contract:
</p>
```
```solidity
pragma solidity ^0.4.24;
// ----------------------------------------------------------------------------
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![Alt text](https://asecuritysite.com/public/sc17.png)
# Additional Tutorial
At the end of this lab, remember to stop your Blockchain (Control-C from the console that is running Geth), and shut down your VM. You may also want to use “rm -r mynapier” in order to delete your blockchain.
## Using Geth
In this tutorial, we will run an Ethereum blockchain on your Ubuntu host: