sol_class2.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "contracts/1_Storage.sol";

contract Example {
// DATA-TYPES
/* 
strings, boolean, integers (uint8,16,24,32,40,48,56,64,72,80,88,96,104,...256, int8,int16...int256), bytes1,2,3,4,5,6...32 (value types) and then bytes(reference type), address, arrays, structs, enums, mappings
uint8 - 2**8 -1
uint16  => 2**16 -1
...
uint256 => 2**256 -1 == 256 bits



if uint8 can hold 0-255 => 2**8 -1
then int8 can hold positive numbers from 0-(255/2)
then the rest is the for negative number -1-(-128)


 */
    // VALUE TYPES
    bool public condition;
    bool public status = true;

    // integers (decimals) (uint - ONLY positive integers/numbers, int - negative & positive integers/numbers)
    uint16 public integer;
   
    // uint8;

    uint number = 115792089237316195423570985008687907853269984665640564039457584007913129639935;
    // uint num2 = -2; // does not work
    int negativeNumber = -20;
    int positiveNumber = 20;
    // addresses
    address public  myAddress; // 20 bytes - 40 hex characters // hex are 0-9,a-f base16
    bytes1 public v0;
    bytes2 private v1 = 0xaf6f;
    bytes3 v2 = 0xb0bef3;
    bytes4 v3 = 0xb0bef354;
    bytes5 v4 = 0xb0bef3540f;
    bytes6 v5 = 0xb0bef3540f44;
    bytes7 v6 = 0xb0bef3540f44ff;
    //...bytes32 





    // REFERENCE TYPES
    // Strings
    // string name;
    string public name = "Jesserc";
    bytes data = hex"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";

    // Arrays
    // can be made with different value data-types
    // you must specify the type of array
    bool[5] statuses = [true, false, true, true, true];
    uint8[15] OnlyPosNumbers = [1,2,3,4,5,255,255,255,255,255,255];
    int16[] negAndPosNumbers = [-12839,29,29990];
    address[] addressList = [0x5B38Da6a701c568545dCfcB03FcB875f56beddC4,0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2,0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2];

    // Structs
    // making our own type of a mix of different datatypes
    //
    struct Person {
     string name;
     uint8 age;
    }

    Person public  person; // actual variable


//  Person person = Person("j",10);
    // Enums - enumerations
    enum FoodStatus {Eaten, NotEaten}
    FoodStatus foodStatus = FoodStatus.NotEaten;


    // MAPPINGS 
    // num[0]; // 1
    // nameOfMapping[firstItemOfTheMapping];// return the corresponding second item of the mapping
    // 1 dimensional mapping
    mapping(address => uint224) public balance;
    // balance[0x5B38Da6a701c568545dCfcB03FcB875f56beddC4]// return uint224 number

    // 2 dimensional mapping
    mapping(string =>  mapping(string => uint128)) public carDetails;
    // carDetails["BMW"]["XYZ"]// return uint128 number





   
   function update() external {
    addressList.push(0x5B38Da6a701c568545dCfcB03FcB875f56beddC4);
     statuses[0] = false;
    balance[0x5B38Da6a701c568545dCfcB03FcB875f56beddC4] = 10;

     person = Person({
        name: "j",
        age: 10
     }); // actual variable

    person.age = 255;
    person.name = "Emma";

    // local
       bytes7 nnnn = 0xb0bef3540f44ff;


       balance[0x5B38Da6a701c568545dCfcB03FcB875f56beddC4] = 10000;
    carDetails["BMW"]["XYZ"] = 2023;
   }


//    function name(params) {

    // uint a = 10; local var
//     code
//    }
}

/* 
Basic file structure of smart contracts
 */


// high level language (solidity) -> low level language (bytecode)


/* 
An example of a bytecode, generated from a solidity high level code
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
Bytecode (compiled smart contracts) runs on the Ethereum virtual machine (EVM).
 */