sc_1 – 第1阶段区块链毕设代写

区块链毕设代写本文提供国外最新区块链项目源码下载,包括solidity,eth,fabric等blockchain区块链,sc_1 – 第1阶段区块链毕设代写 是一篇很好的国外资料

sc_1

Smart Contract 1: Read and write a value on the blockchain

The code was written and tested on Remix IDE here https://remix.ethereum.org/#optimize=false&runs=200&evmVersion=null&version=soljson-v0.8.1+commit.df193b15.js

My first smart contract: a simple code recreated from Part 1 of dApp University’s Intro to Solidity found here: https://www.youtube.com/watch?v=ipwxYa-F1uY

I had to update the code to account for upgrades to Solidity since the video was created (roughly Solidity 0.5 to 0.8). The specific changes were:

  • Solidity 0.5.0 introduced mandatory explicit data location declaration for all variables of struct, array or mapping types. For this contract: add memory keyword for string parameter
  • Solidity 0.6.8 introduces SPDX license identifiers so developers can specify the license the contract uses
  • Starting Solidity 0.7.5, Visibility (public/external) is no longer needed for constructors

When testing the code, I used the JavaScript VM, which is a proxy Ethereum blockchain used for testing smart contracts.

Solidity code creates a smart contract called MyContract that is compiled and deployed on the blockcahin.

The contract itself simply writes a default value and allows the user to read and write a new value by calling the function on the Ethereum blockchain.

In doing so, the user incures gas fees to run each line of code.


sc_1

Smart Contract 1: Read and write a value on the blockchain

The code was written and tested on Remix IDE here https://remix.ethereum.org/#optimize=false&runs=200&evmVersion=null&version=soljson-v0.8.1+commit.df193b15.js

My first smart contract: a simple code recreated from Part 1 of dApp University’s Intro to Solidity found here: https://www.youtube.com/watch?v=ipwxYa-F1uY

I had to update the code to account for upgrades to Solidity since the video was created (roughly Solidity 0.5 to 0.8). The specific changes were:

  • Solidity 0.5.0 introduced mandatory explicit data location declaration for all variables of struct, array or mapping types. For this contract: add memory keyword for string parameter
  • Solidity 0.6.8 introduces SPDX license identifiers so developers can specify the license the contract uses
  • Starting Solidity 0.7.5, Visibility (public/external) is no longer needed for constructors

When testing the code, I used the JavaScript VM, which is a proxy Ethereum blockchain used for testing smart contracts.

Solidity code creates a smart contract called MyContract that is compiled and deployed on the blockcahin.

The contract itself simply writes a default value and allows the user to read and write a new value by calling the function on the Ethereum blockchain.

In doing so, the user incures gas fees to run each line of code.

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https://www.interchains.cc/22446.html

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