www.pudn.com > calc5.zip > funtab.cpp

//------------------------------------ 
//  funtab.cpp 
//  (c) Bartosz Milewski, 1994 
//------------------------------------ 
 
#include "funtab.h" 
#include "symtab.h" 
 
#include  
#include  
#include  
#include  
using std::cerr; 
using std::endl; 
 
namespace Function 
{ 
	double CoTan (double x)  
	{ 
		double y = tan (x); 
		if (y == 0) 
		{ 
			cerr << "cotan of " << x << " undefined\n"; 
			return HUGE_VAL; 
		} 
		return 1.0 / y; 
	} 
 
	class Entry 
	{ 
	public: 
		PFun pFun; 
		char* strFun; 
	}; 
 
	Entry Array [] = 
	{  
		log,  "log", 
		log10,"log10", 
		exp,  "exp", 
		sqrt, "sqrt", 
		sin,  "sin", 
		cos,  "cos", 
		tan,  "tan", 
		CoTan,"cotan", 
		sinh, "sinh", 
		cosh, "cosh", 
		tanh, "tanh", 
		asin, "asin", 
		acos, "acos", 
		atan, "atan", 
	}; 
 
	Table::Table (SymbolTable & symTab) 
		: _size(sizeof Array / sizeof Array [0]) 
	{ 
		_pFun = new PFun [_size]; 
		for (int i = 0; i < _size; ++i) 
		{ 
			int len =  strlen (Array [i].strFun); 
			_pFun [i] = Array [i].pFun; 
			cerr << Array[i].strFun << endl; 
			int j = symTab.ForceAdd (Array[i].strFun); 
			assert (i == j); 
		} 
	} 
 
}