Hello, World!

In this smartbook i wana to  share you the smart contract for the e commerce where use can list their product as well buy / sell from other .

Task :

Create an Ecommerce Smart contract where anyone can list their product and others can buy/sell using the smart contract post as smart contract 

Ide : Remix ide -> https://remix.ethereum.org/.

Prerequiste :

• Knowledge of the  Remix
• Know the basics of the solidity

Code :

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

struct selling_item{
    string Name;
    uint   Id;
    uint   Cost;
    uint   Time;
}

contract shop{
    string[] buyer;
    mapping(uint=>string) itemlist; // this has been made to get the partcular name of the item through the id
    selling_item[] public  selling_items; // this is the object of the struct
    address seller; // address of the owner
    mapping(uint=>uint) cost; // This is used to map b/w the id and the cost .
    constructor(){
        seller = msg.sender;
    }

    modifier onlyonwner(){
        require(seller == msg.sender,"You are not allowed to do this ");
        _;
    }

    function AllItem(string memory _Name , uint _Id, uint _Cost)  public onlyonwner{
        itemlist[_Id] =_Name;
        cost[_Id] = _Cost;
        selling_items.push(selling_item(_Name,_Id,_Cost,block.timestamp));
    }   

    function buy(uint _Id)  public payable{
        uint n = cost[_Id];
        uint cost_ether=(n*10**18); // This is used to convert the amount into the ether
        require(cost_ether==msg.value,"Less sufficent amount");
        buyer.push(itemlist[_Id]);
    }
    function view_item() view  public returns(string[]memory){
        return buyer;
    }


}

Output after deployment :

Explanation :

The basic logic behind this contract is that the owner can llist the Products and anyone can see the product and buy from the listing with the help  of the index of the product .

After buying the use can see  only the name of the product as well as   the whole item information listed  .

All the function button  expalained in detial below

• Allitem : This fucntion is only call and done by  the owner of the contract as only owner can list the item and other user can see this by clicking on the selling item button.
• Seeling_items : This function is  acessible by anyone and can  see the item which are listed for the selling
• Buy : intersteed user can buy the products uisng  the index of that product
• view item : By using view item user can  see their item which he owns .