JSFiddle - React, Tailwind, and code Playground

by marina

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Numeros primos de una matriz 4x4</title>
  
     <SCRIPT LANGUAGE="JavaScript">

function calculate(form) {
var num=parseInt(form.a1.value);
if (isNaN(num) || num < 0) {
form.result.value=(form.a1.value + " no es un número válido. ¡Prueba de nuevo!");
}
if (num == 1 || num == 2) {
form.result.value=(num + " es primo");
}
for (var i=2;i<num;i++) {
if (num % i == 0) {
var prime="yes";
form.result.value=(num + " no es primo.  Es divisible por " + i + ".");
break;
}
if (num % i != 0) var prime="no";
}
if (prime == "no") form.result.value=(num + " es primo");
} 

</SCRIPT>


   <style type="text/css">
<!--
.Estilo1 {
    color: #666666;
    font-family: Georgia, "Times New Roman", Times, serif;
}
-->
   </style>
</head>

<body>



<br><br><br><br>

<center>
  <h2 class="Estilo1">Numeros primos de una matriz 4x4</h2>
</center>

<BR><BR>
<div id="coluno" style="width:350px; text-align:left">
<form name=form>

            <input type="text" name="a1" size="3">
           
           <br/><br/>

    <input type="button" value="es primo?" onClick="calculate(this.form)" style="text-align:right">

    = 
    <input type=text name=result size=35 value=""> 
</form>
<br  />
<form name=form>

            <input type="text" name="a1" size="3">
           
           <br/><br/>

    <input type="button" value="es primo?" onClick="calculate(this.form)">

   = 
   <input type=text name=result size=35 value="">  
</form>
<br />
<form name=form>

            <input type="text" name="a1" size="3">
           
           <br/><br/>

    <input type="button" value="es primo?" onClick="calculate(this.form)" style="text-align:right">

    = 
    <input type=text name=result size=35 value=""> 
</form>
<br  />
<form name=form>

            <input...