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Criba de Eratóstenes en Javascript
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| p { | |
| word-wrap: break-word; | |
| width: 500px; | |
| } |
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| var sieve = function() { | |
| var start = new Date().getTime(); | |
| var primes = []; | |
| var LIMIT = document.getElementById("numb").value; | |
| if(isNaN(LIMIT)){ | |
| document.getElementById('primos').innerHTML = "Ingresa un número válido por favor." | |
| return; | |
| } | |
| var arr = Array(); | |
| var upperLimit = Math.sqrt(LIMIT); | |
| for (var i = 0; i < LIMIT; i++) { // Fills up an array - Llena un arreglo | |
| arr.push(true); | |
| } | |
| for (var i = 2; i <= upperLimit; i++) { // Checks every number up to the upperLimit - Revisa hasta el tope | |
| if (arr[i]) { // If the n exists... - Si el num existe... | |
| for (j = i * i; j < LIMIT; j += i) { // ...deletes all its multiples - ... borra todos sus múltiplos | |
| arr[j] = false; // ... marking them as false - ... marcandolos como falsos. | |
| } | |
| } | |
| } | |
| for (var i = 2; i < LIMIT; i++) { // At last it loops over the array - Al final recorre el arreglo | |
| if (arr[i]) { // If a number is in the cribe | |
| primes.push(i); // ... it is added onto the array for easier printing - ... se agrega a otro arreglo | |
| } | |
| } | |
| document.getElementById('titulo').innerHTML = "Los números primos del 2 al " + LIMIT + " son: "; | |
| document.getElementById('primos').innerHTML = primes + "."; | |
| var end = new Date().getTime(); | |
| var time = end - start; | |
| document.getElementById('tiempo').innerHTML = "El cálculo tardó " + time + " ms."; | |
| } |
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| <html> | |
| <head> | |
| <script type="javascript" src="criba.js"></script> | |
| <link rel="stylesheet" type="text/css" href="criba.css" /> | |
| </head> | |
| <body> | |
| <p id="titulo"> | |
| Ingresa el número límite de primos | |
| </p> | |
| <input id="numb"> | |
| <button type="button" onclick="sieve()">Submit</button> | |
| <p id="primos"> | |
| </p> | |
| <p id="tiempo"> | |
| </p> | |
| </body> | |
| </html> |
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