Understanding a Hello World smart contract

“Hello World” is quite a simple contract and the best one for beginners to smart contract coding and Solidity. You will find that this example is commonly used by new users to get acquainted with Solidity smart contracts.

Here is an example of a HelloWorld smart contract in Solidity, along with a detailed explanation of each line:

pragma solidity ^0.9.0;contract HelloWorld {
    string greeting;
    constructor() {
        greeting = "Hello, World!";
    }
    function greet() public view returns (string memory) {
        return greeting;
    }
}

Let us go through each line:

• pragma solidity ^0.9.0;: This is a pragma version that specifies which version of Solidity the contract uses. The caret symbol (^) indicates that the...