dev-cpp-users

[Dev-C++] Peter You Problem I Solved the Problem.

[Purohit P. J. <pra...@si...>]

In your Program You tried (km_travelled%1000) I guess you wanted to find =
the remainder when km_travelled divided by 1000 The Modulus Operator % =
works only with integers.  If you want to find remainder use integer =
parsing. The Corrected Program Is Included Below....

#include <iostream.h>

void main()

{

     float ini_reading;
     float fin_reading;
     float km_travelled;
     float trav_cost;
     float wear_cost;

     // Title.
     cout << "Calculate the hire car cost. \n\n";

     // Ask for initial odometer reading.
     cout << "Please Enter the initial odometer reading :";
     cin >> ini_reading;

     // Ask for finial reading.
     cout << endl;
     cout << "Please Enter the finial odometer reading :";
     cin >> fin_reading;

     // Calculate costs.
     km_travelled =3D (fin_reading - ini_reading);
     trav_cost =3D (km_travelled * 0.3);
     wear_cost =3D ((km_travelled / 1000) - (((int)km_travelled % 1000) =
/ 100) *
200);

     // Display total hire car cost.
     cout << "The total hire car cost is $" << (wear_cost + trav_cost);
     cout << endl << endl;

     // Finish program.
     cin.ignore(1);
     cin.get();


}





Prahlad J. Purohit...
PH: +91-22-8143953

Re: [Dev-C++] Peter You Problem I Solved the Problem.

[<jos...@ya...>]

Peter,

There're weird thing with float numbers when you try to round or to use
the modulus division. If you use double instead of float you'll see
that the problem is over.

I don't know why but I had the same problem with a currency converter
program. Using (int p = 100 * (float) 0.65) was converted to int 64
whilst double 0.65 was converted to int 65.

Hope this helps

Chemanuel

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Re: [Dev-C++] Peter You Problem I Solved the Problem.

[petermead <pet...@im...>]

Thanks for the responses... I'm learning heaps.
----==<(*)>==----
Peter Mead :^)
pet...@im...
(GMT+10)_Victoria, Australia
~~~~~~~~~~~~~~~~~~~~~~
----- Original Message ----- 
From: "Jose Manuel Padron Carrillo" <jos...@ya...>
To: <dev...@li...>
Sent: Wednesday, March 07, 2001 2:41 AM
Subject: Re: [Dev-C++] Peter You Problem I Solved the Problem.


> 
> Peter,
> 
> There're weird thing with float numbers when you try to round or to use
> the modulus division. If you use double instead of float you'll see
> that the problem is over.
> 
> I don't know why but I had the same problem with a currency converter
> program. Using (int p = 100 * (float) 0.65) was converted to int 64
> whilst double 0.65 was converted to int 65.
> 
> Hope this helps
> 
> Chemanuel
> 
> __________________________________________________
> Do You Yahoo!?
> Get email at your own domain with Yahoo! Mail. 
> http://personal.mail.yahoo.com/
> 
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> http://lists.sourceforge.net/lists/listinfo/dev-cpp-users

Re: [Dev-C++] Peter You Problem I Solved the Problem.

[<jos...@ya...>]

Peter,

In the book I have for C++ says

"All floating-point arithmetic is done in double precision. So the only
time you should use float instead of double is when you are storing
large quantities of real numbers and are concerned about storage space
or access time"

Hope this helps
 
Chemanuel


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RE: [Dev-C++] Peter You Problem I Solved the Problem.

[Ioannis V. <no...@ya...>]

Or mod() from cmath (math.h in C).


Ioannis

* Ioannis Vranos
* Programming pages: http://members.nbci.com/noicys
* Alternative URL: http://run.to/noicys
  -----Original Message-----
  From: dev...@li...
[mailto:dev...@li...]On Behalf Of Purohit
Prahlad Jogaram
  Sent: Tuesday, March 06, 2001 5:17 PM
  To: dev...@li...
  Subject: [Dev-C++] Peter You Problem I Solved the Problem.


  In your Program You tried (km_travelled%1000) I guess you wanted to find
the remainder when km_travelled divided by 1000 The Modulus Operator % works
only with integers.  If you want to find remainder use integer parsing. The
Corrected Program Is Included Below....