diff --git a/mode/c.py b/mode/c.py
index ce83393..281c850 100644
--- a/mode/c.py
+++ b/mode/c.py
@@ -58,19 +58,18 @@ class CGrammar(Grammar):
                          
         PatternRule(r'function', r'[a-zA-Z_][a-zA-Z0-9_]*(?= *\()'),
         PatternRule(r'constant', r"[A-Z_][A-Z0-9_]+"),
-        #PatternRule(r'builtin', r"(?:NULL|TRUE|FALSE)(?![a-zA-Z0-9_])"),
         PatternRule(r'label', r'[a-zA-Z_][a-zA-Z0-9_]*(?=:)'),
         RegionRule(r'error', r'# *error', ErrorGrammar, r'\n$'),
         RegionRule(r'macro', r'# *(?:assert|cpu|define|elif|else|endif|error|ident|ifdef|ifndef|if|import|include_next|line|machine|pragma_once|pragma|system|unassert|undef|warning)(?!=[a-zA-Z0-9_])', MacroGrammar, r'\n$'),
         RegionRule(r'comment', r'/\*', CommentGrammar, r'\*/'),
         PatternRule(r'comment', r'//.*$'),
         RegionRule(r'string', '"', StringGrammar2, '"'),
-        #PatternRule(r"unop", r"!(?!=)|\+=|-=|\*=|/=|//=|%=|&=\|\^=|>>=|<<=|\*\*="),
-        #PatternRule(r'binop', r"\+|<>|<<|<=|<|-|>>|>=|>|\*\*|&|\*|\||/|\^|==|//|~|!=|%"),
+
+        PatternRule(r"float", r"-?[0-9]+\.[0-9]*|-?\.[0-9]+|-?(?:[0-9]|[0-9]+\.[0-9]*|-?\.[0-9]+)[eE][\+-]?[0-9]+"),
+        PatternRule(r"integer", r"(?:0(?![x0-9])|-?[1-9][0-9]*|0[0-7]+|0[xX][0-9a-fA-F]+)[lL]?"),
+
         PatternRule(r"operator", r"!(?!=)|\+=|-=|\*=|/=|//=|%=|&=\|\^=|>>=|<<=|\*\*="),
         PatternRule(r'operator', r"\+|<>|<<|<=|<|-|>>|>=|>|\*\*|&|\*|\||/|\^|==|//|~|!=|%"),
-        PatternRule(r"integer", r"(?:0(?![x0-9])|[1-9][0-9]*|0[0-7]+|0[xX][0-9a-fA-F]+)[lL]?"),
-        PatternRule(r"float", r"[0-9]+\.[0-9]*|\.[0-9]+|(?:[0-9]|[0-9]+\.[0-9]*|\.[0-9]+)[eE][\+-]?[0-9]+"),
         RegionRule(r'macrocomment', r'#if +(?:0|NULL|FALSE)', Grammar, r'#endif'),
         PatternRule(r'char', r"'.'|'\\.'|'\\[0-7]{3}'"),
         PatternGroupRule(r'includegrp', r'macro.start', r'# *include', r'spaces',