topical media & game development
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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lib-js-math-calculator-primes.htm / htm



  
  <!-- THREE STEPS TO INSTALL NUMBER OF PRIMES:
  
    1.  Copy the coding into the HEAD of your HTML document
    2.  Add the onLoad event handler into the BODY tag
    3.  Put the last coding into the BODY of your HTML document  -->
  
  <!-- STEP ONE: Paste this code into the HEAD of your HTML document  -->
  
  <HEAD>
  
  <!-- This script and many more are available free online at -->
  <!-- The JavaScript Source!! http://javascript.internet.com -->
  <!-- Original:  Edemar Costa Oliveira (edemar@decisionway.com) -->
  <!-- Web Site:  http://edemar.cjb.net -->
  <script language=javascript>
  /*
  Script implements the seive of Erastótenes. 
  It finds all the prime numbers up to one determined value. 
  developed by: Edemar C. Oliveira - edemar@hotmail.com
                                  www.edemar.cjb.net        
  */
  function CriaArray (n) { 
          this.length = n 
          for (var i = 1 ; i <= n ; i++) 
                  { this[i] = 1 } 
  } 
  
  function infP(){
  
      var i, k;
          var m;
          var npValue =  prompt("type value: ", "" );
          var npSize = parseInt(npValue);
  
          if (npSize <= 0) {
                  alert ("invalid value!");
                  document.location.reload();
                  return false;
          }
  
          var flags = new CriaArray(npSize) ;
  
      for( i=2; i<=flags.length; i++ ){
              if( flags[i] )
                    for( k=i+1; k<=flags.length; k+=i )
                          flags[k] = 0;
      }
          
          if (npSize > 2)
             m = 2 + ",";
             
      for( i=0; i<=flags.length; i++  )
         if (flags[i] == 0)
            m += i + ",";
  
      alert("The numer of primes up to - " + npSize + " are : " + m );
  } 
  </script>
  
  </HEAD>
  
  <!-- STEP TWO: Insert the onLoad event handler into your BODY tag  -->
  
  <BODY onLoad="infP()">
  
  <!-- STEP THREE: Copy this code into the BODY of your HTML document  -->
  
  <SCRIPT LANGUAGE="JavaScript">
  
  <!-- This script and many more are available free online at -->
  <!-- The JavaScript Source!! http://javascript.internet.com -->
  
  <!-- Begin
  
  //  End -->
  </script>
  
  <p><center>
  <font face="arial, helvetica" size"-2">Free JavaScripts provided<br>
  by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
  </center><p>
  
  <!-- Script Size:  2.05 KB -->
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008

You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.