calc.cpp

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// Calc.cpp : Defines the initialization routines for the DLL.
//

#include "stdafx.h"
#include "Calc.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#include <math.h>
#define N 20
//
//	Note!
//
//		If this DLL is dynamically linked against the MFC
//		DLLs, any functions exported from this DLL which
//		call into MFC must have the AFX_MANAGE_STATE macro
//		added at the very beginning of the function.
//
//		For example:
extern "C" __declspec(dllexport) double Calc(const char exp[])
{
	char ch;	
	//cout<<exp<<endl;
	int add(2),sub(3),mul(4),div(5),op[20],nc(0),oc(0);
	double num[N],rel(0);			
	for(int j=0;j<N;j++)
		num[j]=op[j]=0;
	j=0;
	int len=strlen(exp),i=-1;	
	while(++i<len)
	{
		ch=*(exp+i);	
		if(ch>='0' &&ch<='9' || ch=='+' || ch=='-' || ch=='*' ||ch=='/' ||ch=='(' ||ch==')')
			continue;		
		else 				
			return -99999999.99999;
	
	}
	//cout<<strlen(exp)<<endl;
	for(i=0;i<strlen(exp);i++)
	{	
		
		if(exp[i]<58 && exp[i]>47)	
		{			
			num[nc]=num[nc]*10+int(exp[i])-48;
			//cout<<num[nc]<<' ';
		}
		else 
		{
			//cout<<exp[i]<<' ';
			switch(exp[i])
		{
			case '+':
				op[oc++]=add;				
				break;
			case'-':
				op[oc++]=sub;				
				break;
			case'*':
				op[oc++]=mul;				
				break;
			case'/':
				op[oc++]=div;				
				break;
			case'(':
				add+=10;
				sub+=10;
				mul+=10;
				div+=10;
				break;
			case')':
				add-=10;
				sub-=10;
				mul-=10;
				div-=10;
				break;			
		}
		//cout<<op[oc-1]<<" ";
		}
		if(oc>nc)
		{
			if(op[oc]%10==2){
				op[oc--]=0;
				break;	}

			if(op[oc]%10==3)
				num[nc]=0;//"-x" => "0-x"
			nc++;
		}	
	}
    
	for(int w=0;w<20;w++)
	{
		j=0;
		if(op[0]==0)
			break;
		int temp=op[0]/2;			
		for(int i=0;i<20;i++)			
			if(op[i]/2>temp)
			{	
				j=i;
				temp=op[i]/2;
			}	
		switch(op[j]%10)
		{
		case 2:			
			rel=num[j]+num[j+1];		
			break;
		case 3:
			rel=num[j]-num[j+1];
			break;
		case 4:
			rel=num[j]*num[j+1];
			break;
		case 5:
			rel=num[j]/num[j+1];					
			break;
		}
		temp=j;
		for(j;j<19;j++)
		{				
			op[j]=op[j+1];
			num[j]=num[j+1];
		}
		num[temp]=rel;		
	}
//	cout<<"The result is "<<num[0]<<endl;	
	return num[0];

}
	
//		extern "C" BOOL PASCAL EXPORT ExportedFunction()
//		{
//			AFX_MANAGE_STATE(AfxGetStaticModuleState());
//			// normal function body here
//		}
//
//		It is very important that this macro appear in each
//		function, prior to any calls into MFC.  This means that
//		it must appear as the first statement within the 
//		function, even before any object variable declarations
//		as their constructors may generate calls into the MFC
//		DLL.
//
//		Please see MFC Technical Notes 33 and 58 for additional
//		details.
//

/////////////////////////////////////////////////////////////////////////////
// CCalcApp

BEGIN_MESSAGE_MAP(CCalcApp, CWinApp)
	//{{AFX_MSG_MAP(CCalcApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCalcApp construction

CCalcApp::CCalcApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CCalcApp object

CCalcApp theApp;