geometery prob/prog

**kryptkat** · 01-07-2007

Problem: can not get past 30 feet in square area formula and function. When 31 is entered in the "side" window and the checkbox/pushbutton is pressed even with the changes to code and recompiled
i still get the answer of -2147483648.000000 period. i have changed the call and function from atoi to atol and wtold and the function changes from float to double and long double and still stuck at 31 feet = -2147483648.000000 period.
even if i use unsigned still can not get passed 30 feet. tried powl() that did not fix it eighter.

Code:

   
/* functions */

/* Square */
/* Area */

ASqr( float S )
{
    float A;

    A = pow( 2, S ) ;

return A;
}

....

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{

   char Buffer[50];

   char tmpbuffer[50];

....

   			Client_Edit_Side = CreateWindowEx(WS_EX_STATICEDGE, "Edit", "side", WS_CHILD | WS_VISIBLE, 5, 200, 85, 15, hwnd, NULL, hInstance, 0);
				SendMessage(Client_Edit_Area , WM_SETFONT, (WPARAM)hDefaultFont, MAKELPARAM(FALSE, 0));


....




			Client_Edit_Checkbox1 = CreateWindowEx(WS_EX_STATICEDGE, "Button", "Square Area", BS_AUTOCHECKBOX | WS_CHILD | WS_VISIBLE, 240, 20, 100, 25, hwnd, (HMENU)SQUAREAREA	, hInstance, 0);
				SendMessage(Client_Edit_Checkbox1,WM_SETFONT, (WPARAM)hDefaultFont, MAKELPARAM(FALSE, 0));






....

                                                                                               case SQUAREAREA:
                                                                                               {                                                                                                     
                                                                                                    SetWindowText(Client_Edit_Message, "Square Area");

							                                            GetWindowText(Client_Edit_Side, Buffer, sizeof(Buffer));

                                                                                                    S = atoi(Buffer) ;

                                                                                                    A = ASqr(S);

                                                                                                    sprintf(tmpbuffer , "%f" , A);

                                                                                                    /* holdforstringcat */

                                                                                                    SetWindowText(Client_Edit_Message, tmpbuffer );
                                                                                                    
	
                                                                                               }
                                                                                                break;


....

S = atoi(Buffer) ; changed to S = wtold(Buffer) ; got undefined function then changed to S = atol(Buffer) ; also tried s = atof(buffer);

Code:

ASqr( double S )
{
    long double A;

    A = pow( 2, S ) ;

return A;
}

changed to unsigned long and still stuck. not sure if prob is in the atof call or the sprintf( ... "%f" even tried "%lu" or with the
buffer read. or sendmessage call.

prog. enter data in window press checkbox of geometry then call formula function then return answer then display answer in other answer window.

second question.... why is there no BS_unsetcheck in the checkbox?

**vart** · 01-07-2007

shouldn't be

Code:

double ASqr( double S )
{
    long double A;

    A = pow( 2, S ) ;

return A;
}

**kryptkat** · 01-07-2007

changed to that

enter 31 get 2147483648.000000 but when enter more than (31 )that i get 0 .... still not working

**Salem** · 01-07-2007

Seems like a lack of prototypes, given your first attempt - did you include relevant header files.

Maybe it's an operator overload problem, and using 2 means you get the integer version.
Try say pow(2.0,S)

Also, how long is your wndProc() function to get indentation all the way off the side of the page?

**vart** · 01-07-2007

I think you should check consistensy of all types you use in your calculations
following code works for me without problems

Code:

#include <iostream>
#include <cmath>
long double ASqr( double S )
{
    long double A;

    A = pow( 2, S ) ;

return A;
}
int main()
{
	long double A =ASqr(32);
	std::cout<< A;
	return 0;
}

check that you have no warnings about undefined functions and significant bit looses

**maxorator** · 01-07-2007

Try sprintf with %g. Then it should work.

**kryptkat** · 01-07-2007

>> Seems like a lack of prototypes,
mabey

>> did you include relevant header files.
have stdio.h stdlib.h math.h windows.h that is it.

>>Maybe it's an operator overload problem, and using 2 means you get the integer version.
Try say pow(2.0,S)

forgot to change one unsigned but when changed it did work somewhat. did change pow to powl() function.

Code:

/* functions */

/* Square */
/* Area */

double ASqr( double S )
{
    double   A;

    A = powl( 2, S ) ;

return A;
}

this is what it looks like now.

>>wndProc() function

good sized prog. about 400k small huh?

if i enter over 300 it locks up now

also thank you all for the replys.

**maxorator** · 01-07-2007

Try this. This is an exact replica of your code, but somehow it works.

Code:

#include <windows.h>
#include <math.h>
#include <stdio.h>
#define SQUAREAREA 1000

double ASqr( float S ){
    long double A;
    A=pow(2,S);
    return A;
}
HWND Client_Edit_Side,Client_Edit_Checkbox1,Client_Edit_Message;
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
HINSTANCE hInst;
char szClassName[ ] = "WindowsApp";

int WINAPI WinMain(HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nFunsterStil){
    HWND hwnd;
    MSG messages;
    WNDCLASSEX wincl;
    hInst=hThisInstance;

    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;
    wincl.style = CS_DBLCLKS;
    wincl.cbSize = sizeof (WNDCLASSEX);
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;
    wincl.cbClsExtra = 0;
    wincl.cbWndExtra = 0;
    wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

    if (!RegisterClassEx (&wincl)){
        return 0;
    }

    hwnd=CreateWindowEx(0, szClassName, "Windows App", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,
        544, 375, HWND_DESKTOP, NULL, hThisInstance, NULL);

    ShowWindow (hwnd, nFunsterStil);

    while (GetMessage(&messages, NULL, 0, 0)){
        TranslateMessage(&messages);
        DispatchMessage(&messages);
    }

    return messages.wParam;
}

LRESULT CALLBACK WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){
    char Buffer[50];
    char tmpbuffer[50];
    switch (message){
        case WM_CREATE:{
            HFONT hDefaultFont=(HFONT)GetStockObject(DEFAULT_GUI_FONT);
            Client_Edit_Message=CreateWindowEx(WS_EX_STATICEDGE,"Edit","side",WS_CHILD|WS_VISIBLE,100,200,85,
                15,hwnd,NULL,hInst,0);
            SendMessage(Client_Edit_Message,WM_SETFONT,(WPARAM)hDefaultFont,MAKELPARAM(FALSE,0));
            Client_Edit_Side=CreateWindowEx(WS_EX_STATICEDGE,"Edit","side",WS_CHILD|WS_VISIBLE,5,200,85,
                15,hwnd,NULL,hInst,0);
            SendMessage(Client_Edit_Side,WM_SETFONT,(WPARAM)hDefaultFont,MAKELPARAM(FALSE,0));
            Client_Edit_Checkbox1=CreateWindowEx(WS_EX_STATICEDGE,"Button","Square Area",BS_AUTOCHECKBOX|
                WS_CHILD|WS_VISIBLE,240,20,100,25,hwnd,(HMENU)SQUAREAREA,hInst,0);
            SendMessage(Client_Edit_Checkbox1,WM_SETFONT,(WPARAM)hDefaultFont,MAKELPARAM(FALSE, 0));
            break;
        }
        case WM_COMMAND:
            switch(wParam){
                case SQUAREAREA:{
                    double S,A;
                    SetWindowText(Client_Edit_Message,"Square Area");
                    GetWindowText(Client_Edit_Side, Buffer, sizeof(Buffer));
                    S = atoi(Buffer) ;
                    A = ASqr(S);
                    sprintf(tmpbuffer,"%g",A);
                    /* holdforstringcat */
                    SetWindowText(Client_Edit_Message, tmpbuffer );
                    break;
                }
            }
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hwnd, message, wParam, lParam);
    }
    return 0;
}

Strange design... a part of a larger project?

**kryptkat** · 01-07-2007

>> Try sprintf with %g. Then it should work.

i get scientific notation and it locks up over 200 entered in window (the prog i made )
thank you for the tip.

**kryptkat** · 01-07-2007

max your demo code works. when i enter 4000 i get pow overflow error.

ok chaned mine from atof to atoi(again) it works now

thank you all.

**anonytmouse** · 01-07-2007

I've probably missed something obvious, but if you're trying to calculate the area of a square don't you want S^2 rather than 2^S?

**kryptkat** · 01-08-2007

yes S^2 is what i should have done. functions was from another function doing something diff. i thought exp went first untill i tested it.

Code:

/* powtest.c */


#include<stdio.h>
#include<math.h>

int main()
{

   int a;
   int b;
   int d;


   a = 3;
   b = 9;

   d = pow( 3 , 9 ) ;

printf("\n\n pow ( 3 , 9 ) is %d " , d);

   d = pow ( 9 , 3 ) ;

printf("\n\n pow ( 9 , 3 ) is %d " , d);

return 0;

}

C:\borland\bcc55\bin>powtest

pow ( 3 , 9 ) is 19683

pow ( 9 , 3 ) is 729
C:\borland\bcc55\bin>

also changed to 2.0 for ^.

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