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Smart contract code for Anyone can send coins to each other without a need for registering with a username and password with help of Ethereum keypair

Smart contract code for Anyone can send coins to each other without a need for registering with a username and password with help of Ethereum keypair The contract allows only its creator to create new coins (different issuance schemes are possible). Anyone can send coins to each other without a need for registering with a username and password, all you need is an Ethereum keypair.  // SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.4; contract Coin {     // The keyword "public" makes variables     // accessible from other contracts     address public minter;     mapping (address => uint) public balances;     // Events allow clients to react to specific     // contract changes you declare     event Sent(address from, address to, uint amount);     // Constructor code is only run when the contract     // is created     constructor() {         minter = msg.se...
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How to use referrerpolicy Attribute value ( no-referrer-when-downgrade ) with < iframe > tag in HTML ? with example

How to use referrerpolicy Attribute value ( no-referrer-when-downgrade ) with < iframe > tag in HTML ? with example Referrerpolicy Attribute value ( no-referrer-when-downgrade )    in iframe Default. The referrer header will not be sent to origins without HTTPS. Example <html> <body> <h1>The iframe referrerpolicy attribute Example</h1> <iframe src="https://www.tech.thinkforu.org/"   referrerpolicy="  no-referrer-when-downgrade  "> </iframe> </body> </html>
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Difference between Public vs Internal vs Private state variables in solidity programming langauge with example ?

 Difference between Public vs Internal vs Private state variables in solidity programming langauge with example ? Public state variables can be accessed internally as well as via messages. For a public state variable, an automatic getter function is generated.  Internal state variables can be accessed only internally from the current contract or contract deriving from it without using this.  Private state variables can be accessed only internally from the current contract they are defined not in the derived contract from it. Example of   Public vs Internal vs Private state variables pragma solidity ^0.5.0; contract C {    uint public data = 30;    uint internal iData= 10;        function x() public returns (uint) {       data = 3; // internal access       return data;    } } contract Caller {    C c = new C();    function f() public view returns (uint) {  ...
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Write html code for student registration form ?

 Write html code for student registration form ? <html> <head> <title>Student Registration Form</title> <style> h3{   font-family: Calibri;    font-size: 25pt;            font-style: normal;    font-weight: bold;    color:SlateBlue;   text-align: center;    text-decoration: underline } table{   font-family: Calibri;    color:white;    font-size: 11pt;    font-style: normal;   font-weight: bold;   text-align:;    background-color: SlateBlue;    border-collapse: collapse;    border: 2px solid navy } table.inner{   border: 0px } </style> </head> </style> <body> <h3>STUDENT REGISTRATION FORM</h3>   <table align="center" cellpadding = "10">   <!----- First Name ----------------------------------------------------------> <tr> <td>FI...
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what is solidity programming language ?

What is solidity programming language ?  Solidity is a contract-oriented, high-level programming language for implementing smart contracts. Solidity is highly influenced by C++, Python and JavaScript and has been designed to target the Ethereum Virtual Machine (EVM). Solidity is statically typed, supports inheritance, libraries and complex user-defined types programming language. You can use Solidity to create contracts for uses such as voting, crowdfunding, blind auctions, and multi-signature wallets. When deploying contracts, you should use the latest released version of Solidity. Apart from exceptional cases, only the latest version receives security fixes. Furthermore, breaking changes as well as new features are introduced regularly. We currently use a 0.y.z version number to indicate this fast pace of change. A Simple Smart Contract example  // SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.4.16 <0.9.0; contract SimpleStorage {     uint storedData; ...
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How to add Amazon website inside iframe?

 How to add Amazon website inside iframe? <!DOCTYPE html> <html> <body> <h1>HTML Iframes</h1> <p>You can use the height and width attributes to specify the size of the iframe:</p> <iframe src="https://www.amazon.com/" height="220" width="320" title="Iframe Example"></iframe> </body> </html>
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Is HTML used today?

 Is HTML used today? Yes 101% HTML is used in the world Now ,also any person who want to become web developer he/she is stared from HTML only . HTML is heavily used for creating pages that are displayed on the world wide web. Every page contains a set of HTML tags, including hyperlinks which are used for connecting to other pages. Every page that we witness on the world wide web is written using a version of HTML code.
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How to use arrays in Solidity programming language ?

How to use arrays in Solidity programming language ?  How to use arrays i.e  static array,dynamic array  in Solidity programming language   pragma solidity ^0.5.0; contract test {    function testArray() public pure{       uint len = 7;               //dynamic array       uint[] memory a = new uint[](7);              //bytes is same as byte[]       bytes memory b = new bytes(len);              assert(a.length == 7);       assert(b.length == len);              //access array variable       a[6] = 8;              //test array variable       assert(a[6] == 8);              //static array       uint[3] memory c = [uint(1) , 2, 3];   ...
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