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HelloWeb_5.sol

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
contract Array_5{
   uint[9] array1;
   //bytes[20] array2;
   address[100] array3;
  
   uint[] array4;
  // byte[] array5;
   address array6;
   bytes array7;
//public private internal extranal ,修改方法的可见性的
//pure 不能读，不能写合约变量，view 能读不能写合约的变量，payable 读取合约里面的值也能改写
function test() public{
   uint[] memory array8=new uint[](5);
   bytes memory  array9 = new bytes(10);
   array4 = new uint[](10);
   array4.push(1);
}
struct Student{
    uint256 id;
    uint256 score;
}
Student student;
function structA() external{
    //函数里面的storage student的修改，会影响合约里面的student
    //如果都是storage的变量，就互相影响；都是memory的变量，也互相影响。因为传的是引用类型
    //storage 传给 memory,就是创建一个新副本，不会互相影响。
    Student storage _student = student;
    _student.id = 1;
    _student.score = 100;

}
   

}