Tạo mảng các phần tử ngẫu nhiên, tổng các số nguyên tố

by phuocmien Wed Aug 05, 2015 7:25 am

Javascript

Code:: <script language="javascript"> function ktr(n){ for(var i=0;i<n.length;i++) if(n[i]==' ') return false; } function kt(){ var so=document.f2.txtso.value; alert(so[0]); if(so=="" || isNaN(so) || ktr(so)==false) { alert("Nhap vao 1 so"); document.f2.txtso.focus(); return false; } } </script>

HTML

Code:: <form action="" method="post" name="f2" onsubmit="return kt();"> Nhap sluong PT mang:<input type="text" name="txtso" value="<?php echo @$_REQUEST['txtso'];?>" /> <input type="submit" name="sbok" value="OK" /> </form>

Phan xu ly:
1. Ham so nguyen to

Code:: function SNT($n){ if($n<2) return 0; for($i=2;$i<$n;$i++) if($n%$i==0) return 0; return 1; }

2. Khi nhan vao nut OK

Code:: if(isset($_REQUEST['sbok'])){ $a=array(); $n=$_REQUEST['txtso']; $t=0; for($i=0;$i<$n;$i++) $a[$i]=rand(1,18); foreach($a as $v) if(SNT($v)) echo " <font color='red'>$v</font>"; else echo " $v"; echo "<br>"; for($i=0;$i<$n;$i++) if(SNT($a[$i])) $t+=$a[$i]; echo "Tong cac so nguyen to co trong mang la: $t"; }