created miscfunc.h and .cc to separate some miscellaneous and special functions

miscfunc.h

@@ -0,0 +1,35 @@
+/*
+    LA: linear algebra C++ interface library
+    Copyright (C) 2024 Jiri Pittner <jiri.pittner@jh-inst.cas.cz> or <jiri@pittnerovi.com>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef _MISCFUNC_H
+#define _MISCFUNC_H
+
+
+
+namespace LA {
+
+
+
+extern unsigned long long factorial(const int n);
+extern unsigned long long binom(int n, int k);
+extern unsigned long long longpow(unsigned long long x, int i);
+
+
+}//namespace
+#endif