SimpleStorage

// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

    // Low level Variable boolean, uint, int, address, bytes
    // bool ImHereStoreNumber = true;
    // uint ImHereStoreNumbers = 55;
    // int  ImHereStoreNumberInt = -96;
    // string ImHereStoreNumberInstring = "Nine"; // Characters convert into in bytes  
    // address ImHereStoreAddress = 0xe5cFe709B3eF3d279568F3061061Dd8fBc388BC7;
    // bytes32 ImHereStoreInBytes = "moon"; // bytes always store in 0x12345abcd this formate
    // by default store 0 value
    //0xd9145CCE52D386f254917e481eB44e9943F39138 Every Contract Has unique address like this
    // In Solidity Two Function Not Use Gas For Runing its  View and Pure.
    // view and pure disallow modification of state
    // and Pure disallow you to read from blockchain state see the
    
    //function add() public pure returns (uint256){
        //return (1+1);
    //}
    //by default visibility is private that way we can't see value

contract SimpleStorage {
    
    uint256 ImHereStoreNumber;

    //mapping store value in dictionary form 
    mapping (string => uint256) public nameWhereStoreNumber;

    struct People {
        uint256 ImHereStoreNumber;
        string name;
    }

    People[] public people;

    function store (uint256 _ImHereStoreNumber) public {
        ImHereStoreNumber = _ImHereStoreNumber;

    }

    function retrieve () public view returns (uint256){
        return ImHereStoreNumber;
    }

    // First method: 
    //adding people on array people.push(People(_ImHereStoreNumber,_name)); 
    //Second method: 
    //People memory newPerson = People({ImHereStoreNumber: _ImHereStoreNumber, name: _name});
    //Third method without using memory keyword;
    //people.push(People(_ImHereStoreNumber,_name)); 

    function addPerson(string memory _name, uint256 _ImHereStoreNumber) public {
        people.push(People(_ImHereStoreNumber,_name));
        nameWhereStoreNumber[_name] = _ImHereStoreNumber; 

    }

    // EVM can access and store information in six places:
    // 1.Stack 2.Memory 3.Storage 4.Calldata 5.Code 6.Logs
    //Important storage 1.calldata 2.memory 3.storage
    // Calldata and Memory only exist temprarely
    // calldata can not modify
    // memory can modify 
    // Storage can be modify it is permanent variable
}