【CryptoZombies】lesson1 Chapter 2: Contracts
Solidity's code is encapsulated in contracts.
An empty contract named HelloWorld would look like this.
contract HelloWorld {
}All solidity source code should start with a "version pragma".
pragma solidity ^0.4.19;
contract HelloWorld {
}test
pragma solidity >=0.5.0 <0.6.0;
contract ZombieFactory {
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