diff --git a/elabora.php b/elabora.php
index de3d753..7223216 100644
--- a/elabora.php
+++ b/elabora.php
@@ -135,7 +135,7 @@ $codRaw = implode($codCognome) . implode($codNome) . $codAnno . $codMese . $codG
 //Calcolo carattere di controllo
 //Caratteri pari
 $sumPari=0;
-for($i=1;$i<strlen($codRaw);$i+=2){
+for($i=1;$i<=strlen($codRaw);$i+=2){
     switch($codRaw[$i]){
         case '0':
             $sumPari+=0;
@@ -252,7 +252,7 @@ for($i=1;$i<strlen($codRaw);$i+=2){
 
 $sumDispari=0;
 //Caratteri dispari
-for($i=0;$i<strlen($codRaw);$i+=2){
+for($i=0;$i<=strlen($codRaw);$i+=2){
     switch($codRaw[$i]){
         case '0':
             $sumDispari+=1;
@@ -369,6 +369,86 @@ for($i=0;$i<strlen($codRaw);$i+=2){
 //Calcolo codice di controllo
 $modControllo = ($sumPari + $sumDispari) % 26;
 
+switch($modControllo){
+    case 0:
+        $codControllo = 'A';
+        break;
+    case 1:
+        $codControllo = 'B';
+        break;
+    case 2:
+        $codControllo = 'C';
+        break;
+    case 3:
+        $codControllo = 'D';
+        break;
+    case 4:
+        $codControllo = 'E';
+        break;
+    case 5:
+        $codControllo = 'F';
+        break;
+    case 6:
+        $codControllo = 'G';
+        break;
+    case 7:
+        $codControllo = 'H';
+        break;
+    case 8:
+        $codControllo = 'I';
+        break;
+    case 9:
+        $codControllo = 'J';
+        break;
+    case 10:
+        $codControllo = 'K';
+        break;
+    case 11:
+        $codControllo = 'L';
+        break;
+    case 12:
+        $codControllo = 'M';
+        break;
+    case 13:
+        $codControllo = 'N';
+        break;
+    case 14:
+        $codControllo = 'O';
+        break;
+    case 15:
+        $codControllo = 'P';
+        break;
+    case 16:
+        $codControllo = 'Q';
+        break;
+    case 17:
+        $codControllo = 'R';
+        break;
+    case 18:
+        $codControllo = 'S';
+        break;
+    case 19:
+        $codControllo = 'T';
+        break;
+    case 20:
+        $codControllo = 'U';
+        break;
+    case 21:
+        $codControllo = 'V';
+        break;
+    case 22:
+        $codControllo = 'W';
+        break;
+    case 23:
+        $codControllo = 'X';
+        break;
+    case 24:
+        $codControllo = 'Y';
+        break;
+    case 25:
+        $codControllo = 'Z';
+        break;
+}
 ?>
 <!DOCTYPE html>
 <html lang="it">
