Solidity intelligent Ethernet Square contract

       Ethernet Square has a variety of high-level language that can be used to write intelligent contracts. The most popular one is called Solidity, which is based on JavaScript . Solidity is by far the most mature Ethernet Square language, so it is strongly encouraged community language developers use today.

 

Remix Online Editor

https://remix.ethereum.org/

 

New file, the file extension is .sol

The first program

pragma solidity ^0.4.0;  //版本号

contract HelloWorld{
    string Myname = "hxx";//这样的对象是默认存储在区块链之上的
    
    function getName() public view returns(string){
        return Myname;
    }
}

^ Note the version number of representatives upward compatible, that is, to stop our program is a compilation older than 0.4.0 compiler

Solidity is required semicolon

Compile

Compile success

run

can be seen

We can see the account of money is reduced after deployment, a former 100. Because the deployment takes a certain amount of fuel, with the money to pay for Ethernet

 

pragma solidity ^0.4.0;  //版本号

contract HelloWorld{
    string Myname = "hxx";//这样的对象是默认存储在区块链之上的
    
    function getName() public view returns(string){
        return Myname;
    }
    
    function changeName(string newname)public{
        Myname = newname;
    }
    
}

Ethernet can see the amount of money the code to run more than consumption

Getname and will have the following two options changename

 

 

 

 

 

https://www.bilibili.com/video/BV1St411a7Pk?p=26