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// SPDX-License-Identifier: MIT
pragma solidity >=0.4.0 <0.7.0;
contract SimpleStorage {
    uint storedData;
    function set(uint x) public {
        storedData = x;
    }
    function get() public view returns (uint) {
        return storedData;
    }
}
//—------------------------------------------

pragma solidity >=0.8.9 <0.8.0;
contract NewWorld {
    function New() pure public returns(string memory) {
    return NewWorld;
    }
  }
contract  NewWorld {
  string public data;

function set(string memory_data) public {
  }

function  get () view public returns (string memory) {
  return data ;
  }
}
//====================================

contract  NewWorld {
  uint [] public ids;

function  add (uint id) public {
    ids.push(id);
  }

function get (uint position) view public returns (uint) {
    return ids[position];
  }

function getAll () view public returns (uint[] memory){
        return ids;
  }

function length () view public returns (uint) {
      return ids.length;
  }
}

contract crud {
    struct User {
    uint id;
    string name;
    }
    User [] public users;
    unint  public nextId;

function create (string memory name) public {
    users.push(Users(nextId, name));
    nextId++;
    }

function destroy (uint id) public {
    uint  i = find (id);  
    delete users [i];

}

function  find (uint id) view internal returns (uint) {
      for (uint i=0 ; i < users.length; i ++){
          if (users[i].id  == id) {
                  return  i;
      }
    }

revert("users doesn’t exist!");
}
}