Learn Solidity: Importing Ethereum Smart Contracts

In this post, we will learn how to import Ethereum smart contracts in Solidity Language.

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pragma solidity ^0.4.9;
contract owned {
    function owned() { owner = msg.sender; }
    address owner;
pragma solidity ^0.4.9;

// Solidity supports import statements that are very similar to 
// those available in JavaScript (from ES6 on), although Solidity 
// does not know the concept of a “default export”.

// At a global level, you can use import statements of the following form:

import "./owned.sol";

// import * as symbolName from "filename"; //or 
// import "filename" as symbolName; //both are same
// import {symbol1 as alias, symbol2} from "filename";

// further you can use the contracts of symbols defined in the imported files
contract mortal is owned{
    function kill() {
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