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  1.  
  2. <script>
  3. function tampilkan(){
  4.   var kategori  = document.getElementById("form1").kategori.value;
  5.   if (kategori=="Gula")
  6.     {
  7.         document.getElementById("harga").value = '21500';
  8.     }
  9.   else if (kategori=="Sound")
  10.     {
  11.        document.getElementById("harga").value = '51500';
  12.     }
  13.     else if (kategori=="Kipas Angin")
  14.     {
  15.        document.getElementById("harga").value = '151500';
  16.     }
  17.     else if (kategori=="Lampu Belajar")
  18.     {
  19.        document.getElementById("harga").value = '71500';
  20.     }
  21. }
  22. </script>
  23. <form action="4.php" method="post" id="form1" name="form1">
  24. Barang : <select id="kategori" name="kategori" onchange="tampilkan()">
  25.     <option value="" disabled selected>Pilih</option>
  26.     <option value="Gula">Gula</option>
  27.     <option value="Sound">Sound</option>
  28.     <option value="Kipas Angin">Kipas Angin</option>
  29.     <option value="Lampu Belajar">Lampu Belajar</option>
  30. </select><br>
  31. Harga : <input name="harga" id="harga" type="text" readonly="true"><br>
  32. Bayar : <input name="bayar" type="text"><br>
  33. <input type="submit">
  34. </form>
  35.  
  36. <?php
  37. if(isset($_POST["kategori"])){
  38. $harga = $_POST['harga'];
  39. $bayar = $_POST['bayar'];  
  40.    
  41.    
  42. $Uang=$bayar-$harga;
  43. $Pecahan2=$Uang/50000;
  44. $Sisa1=$Uang%50000;
  45. $Pecahan3=$Sisa1/20000;
  46. $Sisa2=$Sisa1%20000;
  47. $Pecahan4=$Sisa2/10000;
  48. $Sisa3=$Sisa2%10000;
  49. $Pecahan5=$Sisa3/5000;
  50. $Sisa4=$Sisa3%5000;
  51. $Pecahan6=$Sisa4/2000;
  52. $Sisa5=$Sisa4%2000;
  53. $Pecahan7=$Sisa5/1000;
  54. $Sisa6=$Sisa5%1000;
  55. $Pecahan8=$Sisa6/500;
  56. $Sisa7=$Sisa6%500;
  57. echo 'Jumlah Uang:Rp.'.number_format($Uang),'<br/>';
  58. echo '<br/>';
  59. echo 'Pecahan Rp.50000 = '.(int) $Pecahan2.' Lembar';
  60. echo '<br/>';
  61. echo 'Pecahan Rp.20000 = '.(int) $Pecahan3.' Lembar';
  62. echo '<br/>';
  63. echo 'Pecahan Rp.10000 = '.(int) $Pecahan4.' Lembar';
  64. echo '<br/>';
  65. echo 'Pecahan Rp.5000 = '.(int) $Pecahan5.' Lembar';
  66. echo '<br/>';
  67. echo 'Pecahan Rp.2000 = '.(int) $Pecahan6.' Lembar';
  68. echo '<br/>';
  69. echo 'Pecahan Rp.1000 = '.(int) $Pecahan7.' Lembar';
  70. echo '<br/>';
  71. echo 'Pecahan Rp.500 = '.(int) $Pecahan8.' Koin';
  72. }
  73. ?>
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