diff --git a/Convex_hull_2/doc_tex/Convex_hull_2/convex_hull_2.tex b/Convex_hull_2/doc_tex/Convex_hull_2/convex_hull_2.tex
index 056ff2ec9e9..0d734f87c1b 100644
--- a/Convex_hull_2/doc_tex/Convex_hull_2/convex_hull_2.tex
+++ b/Convex_hull_2/doc_tex/Convex_hull_2/convex_hull_2.tex
@@ -64,7 +64,7 @@ polygon is shown at the standard ouput console. The same results could be
 achieved by substituting the function \ccc{CGAL::ch_graham_andrew} by other 
 function like \ccc{CGAL::ch_bykat}.
 
-\ccIncludeExampleCode{Convex_hull_2/ch_example_from_cin_to_cout.C}
+\ccIncludeExampleCode{Convex_hull_2/ch_example_from_cin_to_cout.cpp}
 
 
 \section{Extreme Points and Hull Subsequences}
diff --git a/Convex_hull_2/doc_tex/Convex_hull_2_ref/convex_hull_2.tex b/Convex_hull_2/doc_tex/Convex_hull_2_ref/convex_hull_2.tex
index f8d2834fd04..800c9633f63 100644
--- a/Convex_hull_2/doc_tex/Convex_hull_2_ref/convex_hull_2.tex
+++ b/Convex_hull_2/doc_tex/Convex_hull_2_ref/convex_hull_2.tex
@@ -82,7 +82,7 @@ Remember, that when no traits class is specified for the function
 \ccc{convex_hull_2}, the kernel from which the input points come is
 used as the default traits class.
 
-%\ccIncludeExampleCode{Convex_hull_2/convex_hull_2.C}
+%\ccIncludeExampleCode{Convex_hull_2/convex_hull_2.cpp}
 
 \ccIndexMainItemEnd{convex hull, 2D}
 \end{ccRefFunction}
diff --git a/Convex_hull_2/examples/Convex_hull_2/ch_example_from_cin_to_cout.C b/Convex_hull_2/examples/Convex_hull_2/ch_example_from_cin_to_cout.cpp
similarity index 100%
rename from Convex_hull_2/examples/Convex_hull_2/ch_example_from_cin_to_cout.C
rename to Convex_hull_2/examples/Convex_hull_2/ch_example_from_cin_to_cout.cpp
diff --git a/Convex_hull_2/examples/Convex_hull_2/ch_example_timing.C b/Convex_hull_2/examples/Convex_hull_2/ch_example_timing.cpp
similarity index 100%
rename from Convex_hull_2/examples/Convex_hull_2/ch_example_timing.C
rename to Convex_hull_2/examples/Convex_hull_2/ch_example_timing.cpp
diff --git a/Convex_hull_2/examples/Convex_hull_2/ch_graham_anderson.C b/Convex_hull_2/examples/Convex_hull_2/ch_graham_anderson.cpp
similarity index 100%
rename from Convex_hull_2/examples/Convex_hull_2/ch_graham_anderson.C
rename to Convex_hull_2/examples/Convex_hull_2/ch_graham_anderson.cpp