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fungmath.cpp
00001 /*************************************************************************** 00002 fungmath.h - description 00003 ------------------- 00004 begin : Mon May 12 2003 00005 copyright : (C) 2003 by Fungmeista 00006 email : mizunoami44@users.sourceforge.net 00007 ***************************************************************************/ 00008 00009 /*************************************************************************** 00010 * * 00011 * This program is free software; you can redistribute it and/or modify * 00012 * it under the terms of the GNU General Public License as published by * 00013 * the Free Software Foundation; either version 2 of the License, or * 00014 * (at your option) any later version. * 00015 * * 00016 ***************************************************************************/ 00017 #include "fungmath.h" 00018 00019 #include <cmath> 00020 #include <ctime> 00021 #include <cstdlib> 00022 00023 int num_digits( int i ) 00024 { 00025 int n = i / 10; 00026 if ( n == 0 ) 00027 return 1; 00028 else 00029 return num_digits( n ); 00030 00031 } 00032 00033 int fibonacci( unsigned int n ) 00034 { 00035 if ( n == 0) 00036 return 0; 00037 else if ( n == 1 ) 00038 return 1; 00039 else 00040 return fibonacci( n - 1 ) + fibonacci( n - 2 ); 00041 } 00042 00043 int factorial( unsigned int n ) 00044 { 00045 if ( n == 0 ) 00046 return 1; 00047 else 00048 return factorial( n - 1 ) * n; 00049 } 00050 00051 int iRand( float low, float high ) 00052 { 00053 return (rand() % static_cast<int>(ROUND(high-low-1)))+static_cast<int>(ROUND(low)) + 1; 00054 } 00055 00056 float fRand( float low, float high ) 00057 { 00058 return static_cast<float>(rand())/static_cast<float>(RAND_MAX) * (high-low) + low; 00059 } 00060 00061 00062