diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/AbstractGNUSourceCodeParser.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/AbstractGNUSourceCodeParser.java
index 7129bef1679..78b1afdf868 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/AbstractGNUSourceCodeParser.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/AbstractGNUSourceCodeParser.java
@@ -6,10 +6,10 @@
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
- * IBM Rational Software - Initial API and implementation
- * Markus Schorn (Wind River Systems)
- * Ed Swartz (Nokia)
- * Mike Kucera (IBM) - bug #206952
+ *    IBM Rational Software - Initial API and implementation
+ *    Markus Schorn (Wind River Systems)
+ *    Ed Swartz (Nokia)
+ *    Mike Kucera (IBM) - bug #206952
  *******************************************************************************/
 package org.eclipse.cdt.internal.core.dom.parser;
 
@@ -154,8 +154,13 @@ public abstract class AbstractGNUSourceCodeParser implements ISourceCodeParser {
 
     // Use to create the completion node
     protected ASTCompletionNode createCompletionNode(IToken token) {
+    	// the preprocessor may deliver tokens for literals or header-names.
         if (completionNode == null && token != null)
-            completionNode = new ASTCompletionNode(token, getTranslationUnit());
+        	switch(token.getType()) {
+        	case IToken.tCOMPLETION:
+                completionNode = new ASTCompletionNode(token, getTranslationUnit());
+                break;
+        	}
         return completionNode;
     }
 
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/CPreprocessor.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/CPreprocessor.java
index 0251644373a..027b02ece9b 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/CPreprocessor.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/CPreprocessor.java
@@ -173,6 +173,7 @@ public class CPreprocessor implements ILexerLog, IScanner {
     private String[][] fPreIncludedFiles= null;
 
     private int fContentAssistLimit= -1;
+	private boolean fHandledCompletion= false;
 
     // state information
     private final CharArrayObjectMap fMacroDictionary = new CharArrayObjectMap(512);
@@ -416,7 +417,12 @@ public class CPreprocessor implements ILexerLog, IScanner {
     		return t;
     	}
     	
-    	t= internalFetchToken(true, false, true, fRootContext);
+    	try {
+			t= internalFetchToken(true, false, true, fRootContext);
+		} catch (OffsetLimitReachedException e) {
+			fHandledCompletion= true;
+			throw e;
+		}
     	final int offset= fLocationMap.getSequenceNumberForOffset(t.getOffset());
 		final int endOffset= fLocationMap.getSequenceNumberForOffset(t.getEndOffset());
 		t.setOffset(offset, endOffset);
@@ -440,18 +446,18 @@ public class CPreprocessor implements ILexerLog, IScanner {
         }
         
     	Token t1= fetchToken();
-    	if (t1.getType() == IToken.tEND_OF_INPUT) {
+    	switch (t1.getType()) {
+    	case IToken.tCOMPLETION:
+    		fHandledCompletion= true;
+    		break;
+    	case IToken.tEND_OF_INPUT:
     		if (fContentAssistLimit >= 0) {
-    			int useType= IToken.tCOMPLETION; 
-    			if (fLastToken != null) {
-    				final int lt= fLastToken.getType();
-    				if (lt == IToken.tCOMPLETION || lt == IToken.tEOC) {
-    					useType= IToken.tEOC;
-    				}
-    			}
+        		int useType= fHandledCompletion ? IToken.tEOC : IToken.tCOMPLETION; 
     			int sequenceNumber= fLocationMap.getSequenceNumberForOffset(fContentAssistLimit);
     			t1= new Token(useType, null, sequenceNumber, sequenceNumber);
+    			fHandledCompletion= true;
     		}
+    		break;
     	}
     	if (fLastToken != null) {
     		fLastToken.setNext(t1);
@@ -474,19 +480,18 @@ public class CPreprocessor implements ILexerLog, IScanner {
     	
     	final int tt1= t1.getType();
     	switch(tt1) {
+    	case IToken.tCOMPLETION:
+    		fHandledCompletion= true;
+    		break;
+    		
     	case IToken.tEND_OF_INPUT:
     		if (fContentAssistLimit < 0) {
     			throw new EndOfFileException();
     		}
-    		int useType= IToken.tCOMPLETION; 
-    		if (fLastToken != null) {
-    			final int lt= fLastToken.getType();
-    			if (lt == IToken.tCOMPLETION || lt == IToken.tEOC) {
-    				useType= IToken.tEOC;
-    			}
-    		}
+    		int useType= fHandledCompletion ? IToken.tEOC : IToken.tCOMPLETION; 
     		int sequenceNumber= fLocationMap.getSequenceNumberForOffset(fContentAssistLimit);
     		t1= new Token(useType, null, sequenceNumber, sequenceNumber);
+    		fHandledCompletion= true;
     		break;
     		
     	case IToken.tSTRING:
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/Lexer.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/Lexer.java
index e0009e93e75..821ccfffb98 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/Lexer.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/Lexer.java
@@ -174,6 +174,7 @@ final public class Lexer {
 				throw new OffsetLimitReachedException(origin, t);
 			case IToken.tEND_OF_INPUT:
 				if (fSupportContentAssist) {
+					t.setType(IToken.tCOMPLETION);
 					throw new OffsetLimitReachedException(origin, t);
 				}
 				// no break;
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/MacroExpander.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/MacroExpander.java
index 871303f0c78..228c01df65c 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/MacroExpander.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/MacroExpander.java
@@ -299,6 +299,7 @@ public class MacroExpander {
         	case IToken.tEND_OF_INPUT:
         		assert nesting >= 0;
         		if (fCompletionMode) {
+        			t.setType(IToken.tCOMPLETION);
         			throw new OffsetLimitReachedException(ORIGIN, null);
         		}
         		break loop;
diff --git a/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java b/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java
index fae9f90fc3e..8be873987d0 100644
--- a/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java
+++ b/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java
@@ -889,4 +889,10 @@ public class CompletionTests extends AbstractContentAssistTest {
 		final String[] expected= new String[0];
 		assertCompletionResults(fCursorOffset, expected, AbstractContentAssistTest.COMPARE_REP_STRINGS);
 	}
+	
+	// void func() {float a; a= 1./*cursor*/}
+	public void testCompletionInFloatingPointLiteral_Bug193464() throws Exception {
+		final String[] expected= new String[0];
+		assertCompletionResults(fCursorOffset, expected, AbstractContentAssistTest.COMPARE_REP_STRINGS);
+	}
 }
diff --git a/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests_PlainC.java b/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests_PlainC.java
index 11debb27e6c..47fa7d4bc1f 100644
--- a/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests_PlainC.java
+++ b/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests_PlainC.java
@@ -182,4 +182,10 @@ public class CompletionTests_PlainC extends AbstractContentAssistTest {
 		final String[] expected= new String[0];
 		assertCompletionResults(expected);
 	}
+	
+	// void func() {float a; a= 1./*cursor*/}
+	public void testCompletionInFloatingPointLiteral_Bug193464() throws Exception {
+		final String[] expected= new String[0];
+		assertCompletionResults(expected);
+	}
 }