Solved

Problem writing C++ Program that use data files for input and output.

Posted on 2006-11-13
6
621 Views
Last Modified: 2008-01-09
Hello,

I seem to be stuck writing this program that inputs a series of 12 temperatures from the user. It should write out on the file "tempdata.dat" each temperature and the difference between the current temperature and the one preceeding it. The differne is not  output for the first temperature this is input. At the end of the program, the average temperature should be displayed for the user via cout. Here's the given input data:

34.5  38.6  42.4  46.8  51.3  63.1  60.2  55.9  60.3  56.7  50.3  42.2  

File tempdata.dat would contain:

34.5

38.6   4.1

42.2   3.8

46.8   4.4

51.3   4.5

63.1   11.8

60.2   -2.9

55.9   -4.3

60.3   4.4

56.7   -3.6

50.3  -6.4

42.2  -8.1

This is what I have come up with so far but I got stuck as to what to do next about the computation in getting the difference between the temperatures. Can someone please help.

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
    // Declare and open files
    ifstream inData;
    ofstream outData;
   
    inData.open("tempdata.dat")
    outData.open("tempdata.out")
   
    //Read in data from file inData
    inData >> 34.5 >> 38.6 >> 42.4 >> 46.8 >> 51.3 >> 63.1 >> 60.2 >>
           >> 55.9 >> 60.3 >> 56.7 >> 50.3 >> 42.2;
   
    //Output information in required formats
0
Comment
Question by:DeaconRev2
6 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 17935399
Do you understand how the >> operator works?
0
 
LVL 39

Accepted Solution

by:
itsmeandnobodyelse earned 500 total points
ID: 17937426
It seems to me that you yoou didn't read the requirements correctly ....

>>>> that inputs a series of 12 temperatures from the user.

I would say you would need a loop to get 12 temperatures from the user, something like

   for (int i=0; i < 12; ++i)
   {
        // prompt for input
     
        // read input from cin to  temperature array at position i
   }

>>>> It should write out on the file "tempdata.dat" each temperature and the difference
>>>> between the current temperature and the one preceeding it.

That means that you need a further loop where you output the temperature array at position j and the difference between temperature array at position j and  temperature array at position j-1. Note, for the latter you have to check that i is greater 0.

   // open tempdata.dat for output

   for (int j=0; j < 12; ++j)
   {
        // output to file temperature array at position j  + space separator  
        // if j > 0 output to file temperature array at position j - temperature array at position j - 1
   }

>>>> At the end of the program, the average temperature should be displayed for the user via cout.

Make another loop and add all temperature values from array. Then output the stotal divided by 12.

Regrads, Alex
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

C++ Properties One feature missing from standard C++ that you will find in many other Object Oriented Programming languages is something called a Property (http://www.experts-exchange.com/Programming/Languages/CPP/A_3912-Object-Properties-in-C.ht…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
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.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

863 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

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now