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program that reads from a text file & give results

Posted on 2000-02-15
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Last Modified: 2010-04-02
I wrote a small program in C++ that reads from a text file, but I am having a problem with it
since, its main job is to read a line at a time of information in the following form:

11-02-99 16:32      Inconet      00:08:46      330889      0.31$
11-02-99 21:13      Cyberia      00:20:07      744002      0.23$

And count the amount of monthly time online & the rate (the fourth and last column)
My program is the following:

#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>
#include <stdlib.h>
void main()
{
      char date[8], logtime[5], ISP[15], staytime[8], dollars[5];
      double phonenumber;
      float fee=0.00 , a=0.00 , b=0.00 ,c=0.00; // a,b,c are the numbers from the amount in $

      ifstream textfile("a:\\log1.txt", ios::in);            //read from the text file
      while (textfile >> date >> logtime >> ISP >>staytime >> phonenumber >> dollars){
            a= dollars[0]; b= dollars[2]; c= dollars[3]; // Omitted the point
            fee+= a + b/10 + c/100;
            cout << dollars << "\t" << a << "\t" << b << "\t" << c << "\t" << fee << endl;
      }
      //cout <<"\n\nThe total amount until now is\t" << fee <<"\n\n\n";
      textfile.close();
}
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Question by:Samer Kharsa
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by:aperdon
ID: 2525014
what problem you have?
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Accepted Solution

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aperdon earned 100 total points
ID: 2525032
The dollars variable is a character array. It contains digits in ASCII-coding. You should substrat the ascii value for '0' to get the correct value.

a= dollars[0] - '0'; b= dollars[2] - '0'; c= dollars[3] - '0'; // Omitted the point
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Expert Comment

by:nietod
ID: 2525302
You can also read the floating point value directly, like

textfile >> date >> logtime >> ISP >>staytime >> phonenumber >> fee;
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by:aperdon
ID: 2525310
it is better, although I wanted to show what was actually wrong with the code.
now he knows about this ascii<->digit conversion, which in case of direct reading was not the case
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Expert Comment

by:nietod
ID: 2525383
agreed, I thought both points were worth mentioning.  The first is worth knowing for future reference, the later probably worth doing for this case.
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by:aperdon
ID: 2525394
yeppes, i totaly agree
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Author Comment

by:Samer Kharsa
ID: 2531946
Thanks guys
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