diff --git a/AutoUpdater.xml b/AutoUpdater.xml
index 6c07b03..4d627bd 100644
--- a/AutoUpdater.xml
+++ b/AutoUpdater.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <item>
-  <version>1.2.0.1</version>
+  <version>1.2.1.0</version>
   <url>https://github.com/PocketMiner82/pseudocode-ide/releases/latest/download/pseudocode-ide.zip</url>
   <changelog>https://github.com/PocketMiner82/pseudocode-ide/releases</changelog>
   <mandatory>false</mandatory>
diff --git a/SolutionInfo.cs b/SolutionInfo.cs
index 8dca432..89d88ce 100644
--- a/SolutionInfo.cs
+++ b/SolutionInfo.cs
@@ -1,4 +1,4 @@
 using System.Reflection;
 
-[assembly: AssemblyVersion("1.2.0.1")]
-[assembly: AssemblyFileVersion("1.2.0.1")]
+[assembly: AssemblyVersion("1.2.1.0")]
+[assembly: AssemblyFileVersion("1.2.1.0")]
diff --git a/pseudocodeIde/PseudocodeIDEForm.cs b/pseudocodeIde/PseudocodeIDEForm.cs
index c47eb66..e430618 100644
--- a/pseudocodeIde/PseudocodeIDEForm.cs
+++ b/pseudocodeIde/PseudocodeIDEForm.cs
@@ -227,8 +227,8 @@ private void codeTextBox_TextChanged(object sender, EventArgs e)
 
         private void codeTextBox_KeyDown(object sender, KeyEventArgs e)
         {
-            // ignore CTRL[+SHIFT]+(Z/Y/L/R/E)
-            if ((e.KeyCode == Keys.Z || e.KeyCode == Keys.Y || e.KeyCode == Keys.L || e.KeyCode == Keys.R || e.KeyCode == Keys.E)
+            // ignore CTRL[+SHIFT]+(Z/Y/L/R/E/S)
+            if ((e.KeyCode == Keys.Z || e.KeyCode == Keys.Y || e.KeyCode == Keys.L || e.KeyCode == Keys.R || e.KeyCode == Keys.E || e.KeyCode == Keys.S)
                 && (Control.ModifierKeys == Keys.Control || Control.ModifierKeys == (Keys.Control | Keys.Shift)))
             {
                 e.SuppressKeyPress = true;
diff --git a/pseudocodeIde/interpreter/parser/Parser.cs b/pseudocodeIde/interpreter/parser/Parser.cs
index cb621f1..1f491da 100644
--- a/pseudocodeIde/interpreter/parser/Parser.cs
+++ b/pseudocodeIde/interpreter/parser/Parser.cs
@@ -289,7 +289,7 @@ private string handleDoWhile()
             do
             {
                 this.advance();
-                output += this.parseToken(output.LastOrDefault(), true);
+                output += this.parseToken(output.LastOrDefault());
                 currentToken = this.peek();
             }
             while (!this.isAtEnd() && currentToken.type != WHILE);
diff --git a/pseudocodeIde/interpreter/scanner/Scanner.cs b/pseudocodeIde/interpreter/scanner/Scanner.cs
index a8785b3..878ba03 100644
--- a/pseudocodeIde/interpreter/scanner/Scanner.cs
+++ b/pseudocodeIde/interpreter/scanner/Scanner.cs
@@ -1,5 +1,7 @@
 using pseudocodeIde.interpreter.logging;
+using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using static pseudocodeIde.interpreter.TokenType;
 
 namespace pseudocodeIde.interpreter
@@ -184,17 +186,24 @@ private void scanToken()
                 case '\'': this.handleChar(); break;
 
                 default:
-                    if (this.isDigit(c))
+                    try
                     {
-                        this.handleNumber();
-                    }
-                    else if (this.isAlpha(c))
-                    {
-                        this.handleIdentifier();
+                        if (this.isDigit(c))
+                        {
+                            this.handleNumber();
+                        }
+                        else if (this.isAlpha(c))
+                        {
+                            this.handleIdentifier();
+                        }
+                        else
+                        {
+                            Logger.error(this.line, $"Unerwartetes Zeichen: '{c}'.");
+                        }
                     }
-                    else
+                    catch (Exception e)
                     {
-                        Logger.error(this.line, $"Unerwartetes Zeichen: '{c}'.");
+                        Logger.error(this.line, $"Unerwartete Zeichen nach '{c}'. {e.GetType().Name}: {e.Message}");
                     }
                     break;
             }
@@ -286,6 +295,32 @@ private void handleNumber()
                     this.advance();
                 }
             }
+            else if (this.peek() == 'x' && this.isHexDigit(this.peekNext()))
+            {
+                // consume the 'x'
+                this.advance();
+
+                while (this.isHexDigit(this.peek()))
+                {
+                    this.advance();
+                }
+                // start + 2 because the '0x' must be removed
+                this.addToken(NUMBER, Convert.ToInt32(this.code.Substring(this.start + 2, this.current - this.start), 16));
+                return;
+            }
+            else if (this.peek() == 'b' && this.isBinaryDigit(this.peekNext()))
+            {
+                // consume the 'b'
+                this.advance();
+
+                while (this.isBinaryDigit(this.peek()))
+                {
+                    this.advance();
+                }
+                // start + 2 because the '0b' must be removed
+                this.addToken(NUMBER, Convert.ToInt32(this.code.Substring(this.start, this.current - this.start).Substring(2), 2));
+                return;
+            }
 
             this.addToken(NUMBER, double.Parse(this.code.Substring(this.start, this.current - this.start)));
         }
@@ -394,6 +429,18 @@ private bool isDigit(char c)
             return c >= '0' && c <= '9';
         }
 
+        private bool isHexDigit(char c)
+        {
+            return isDigit(c) ||
+                (c >= 'a' && c <= 'f') ||
+                (c >= 'A' && c <= 'F');
+        }
+
+        private bool isBinaryDigit(char c)
+        {
+            return c == '0' || c == '1';
+        }
+
         private bool isAlpha(char c)
         {
             return (c >= 'a' && c <= 'z') ||