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diff --git a/src/c/elementaryFunctions/log2/slog2s.c b/src/c/elementaryFunctions/log2/slog2s.c
new file mode 100644
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+++ b/src/c/elementaryFunctions/log2/slog2s.c
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+/* Copyright (C) 2017 - IIT Bombay - FOSSEE
+
+ This file must be used under the terms of the CeCILL.
+ This source file is licensed as described in the file COPYING, which
+ you should have received as part of this distribution.  The terms
+ are also available at
+ http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ Organization: FOSSEE, IIT Bombay
+ Author: Brijesh Gupta C R
+ Email: toolbox@scilab.in
+*/
+#include <stdio.h>
+#include <math.h>
+#include "factorial.h"
+#include "log2.h"
+
+float slog2s(float inp)
+{
+    return log(inp)/log(2);
+}