Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

program that reads from a text file & give results

Posted on 2000-02-15
7
Medium Priority
?
235 Views
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();
}
0
Comment
Question by:Samer Kharsa
  • 4
  • 2
7 Comments
 
LVL 1

Expert Comment

by:aperdon
ID: 2525014
what problem you have?
0
 
LVL 1

Accepted Solution

by:
aperdon earned 400 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
0
 
LVL 22

Expert Comment

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

textfile >> date >> logtime >> ISP >>staytime >> phonenumber >> fee;
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 1

Expert Comment

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
0
 
LVL 22

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.
0
 
LVL 1

Expert Comment

by:aperdon
ID: 2525394
yeppes, i totaly agree
0
 

Author Comment

by:Samer Kharsa
ID: 2531946
Thanks guys
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
Article by: evilrix
Looking for a way to avoid searching through large data sets for data that doesn't exist? A Bloom Filter might be what you need. This data structure is a probabilistic filter that allows you to avoid unnecessary searches when you know the data defin…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.

963 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question