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Help with calculating avrg from input file.

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swordy06

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Help with calculating avrg from input file.

Mar 25th, 2007

Hi fellow c++ programmers,

I need some help with an assignment from my c++ class. The assignment is to use a input file with the following

1 4/12/2007 34 -- 1 is the reference number, date , and temperature to be converted to farenheit.

Now i have to output it to a .txt file that looks like this:

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CELCIUS TO FAHRENHEIT CONVERSION
----------------------------------
REF. DATE CONVERSION
1 4/12/2007 1°F
2 4/12/2007 1°F
3 4/12/2007 2°F
4 4/12/2007 3°F
6 4/12/2007 4°F
7 4/12/2007 5°F
8 4/12/2007 6°F
9 4/12/2007 6°F
10 4/12/2007 7°F
11 4/12/2007 7°F
12 4/12/2007 8°F
13 4/12/2007 9°F
14 4/12/2007 10°F
15 4/12/2007 10°F
16 4/12/2007 11°F
17 4/12/2007 11°F
18 4/12/2007 12°F
19 4/12/2007 13°F
20 4/12/2007 13°F
21 4/12/2007 14°F
22 4/12/2007 15°F
23 4/12/2007 15°F
24 4/12/2007 16°F
----------------------------------
Total temperature average:

my problem is, that i have been trying to use a counter to display the average and im stumped... simply put i have no idea how to do it and i cant seem to find information on how to do it anywhere. Heres the code i have done so far, any help or explanation is appreciated.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream.h>
#include <fstream.h>
int Celsius(int); //Celsius conversion formula function
int main()
{
    // Variables Setup
    int ref, ctemp, myloop;
    char mydate[9];
    //File Management
    ifstream inFile; //Input File Logical Name
    ofstream outFile; //Output File Logical Name
    inFile.open("H:\\1.dat"); //Input File Merge Setup
    outFile.open("H:\\2.txt"); //Output File Merge Setup
    inFile >> ref >> mydate >> ctemp; // Read File
 
    //Headings
    outFile << "\tCELCIUS TO FAHRENHEIT CONVERSION" << endl;
    outFile << "\t";
    for (myloop=1; myloop<35; myloop++)
        {outFile << "-";} // Dash Line Print Cycle
        outFile << endl;
        outFile << "\tREF." << "\tDATE" << "\tCONVERSION" << endl << endl;
        // End of Headings
        while (inFile) //End-ofFile Controlled Loop
        {
              outFile << "\t" << ref << "\t" << mydate << "\t" << Celsius(ctemp)
              << "°F" << endl << endl; // Write Record
              inFile >> ref >> mydate >> ctemp; // Read File
        }
          outFile << "\t";
          for (myloop=1; myloop<35; myloop++)
          {outFile << "-";} // Dash Line Print Cycle
          outFile << endl;
          outFile << "\tTotal temperature average:" << endl;
          int number;
          int average;
          int count = 0;
          {
          ctemp += number;
          count++;
               }
                  average = ctemp / count;
 
               return 0;
               }
 
              int Celsius(int ctemp) // Celsius to Fahrenheit Conversion Function
              {
                  int ctof = 0;
                  ctof = (ctemp - 32) * 5/9;
                  ctemp = ctof;
                  return ctemp;
                  }
#include <iostream.h>
#include <fstream.h>
int Celsius(int); //Celsius conversion formula function
int main()
{
    // Variables Setup
    int ref, ctemp, myloop;
    char mydate[9];
    //File Management
    ifstream inFile; //Input File Logical Name
    ofstream outFile; //Output File Logical Name
    inFile.open("H:\\1.dat"); //Input File Merge Setup
    outFile.open("H:\\2.txt"); //Output File Merge Setup
    inFile >> ref >> mydate >> ctemp; // Read File
    
    //Headings
    outFile << "\tCELCIUS TO FAHRENHEIT CONVERSION" << endl;
    outFile << "\t";
    for (myloop=1; myloop<35; myloop++)
        {outFile << "-";} // Dash Line Print Cycle
        outFile << endl;
        outFile << "\tREF." << "\tDATE" << "\tCONVERSION" << endl << endl;
        // End of Headings
        while (inFile) //End-ofFile Controlled Loop
        {
              outFile << "\t" << ref << "\t" << mydate << "\t" << Celsius(ctemp)
              << "°F" << endl << endl; // Write Record
              inFile >> ref >> mydate >> ctemp; // Read File
        }
          outFile << "\t";
          for (myloop=1; myloop<35; myloop++)
          {outFile << "-";} // Dash Line Print Cycle
          outFile << endl;
          outFile << "\tTotal temperature average:" << endl;
          int number;
          int average;
          int count = 0;
          {
          ctemp += number;
          count++;
               }
                  average = ctemp / count;
   
               return 0;
               }

              int Celsius(int ctemp) // Celsius to Fahrenheit Conversion Function
              {
                  int ctof = 0;
                  ctof = (ctemp - 32) * 5/9;
                  ctemp = ctof;
                  return ctemp;
                  }

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Re: Help with calculating avrg from input file.

Mar 25th, 2007

Look at your output table.... do you see anything in your code you could use as a counter? (hint: your days are numbered)

Last edited by Clinton Portis; Mar 25th, 2007 at 7:40 pm.

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John A

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Re: Help with calculating avrg from input file.

Mar 25th, 2007

>my problem is, that i have been trying to use a counter to display the average and im stumped
The problem is that you need to store the data in some sort of array -- preferably a vector, and then you can calculate the average.

Vectors are nice, because they can dynamically resize. I suggest you read up on them here:
http://www.cprogramming.com/tutorial/stl/vector.html

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swordy06

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Re: Help with calculating avrg from input file.

Mar 26th, 2007

how would i apply the vector to my code?? by using vector <int>; and including all the reference numbers or is there a more simple way because i really dont understand the explanation that is in that link. Thanks for the replies!

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Re: Help with calculating avrg from input file.

Mar 26th, 2007

>how would i apply the vector to my code??
Basically keep pushing values into the vector as you read in new temperatures. Then outside of the loop, you would read them out and add up the total, yada yada.

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swordy06

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Re: Help with calculating avrg from input file.

Mar 26th, 2007

Ok, so it would go something like this :

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
{
vector <int> num;         //Vector to store integers
    num.push_back(1);         
    num.push_back(2);       
    num.push_back(3); 
    //**etc. till 24       
    for(int x=0; x<num.size(); x++) 
    {
     cout << num[x]/24 << " ";
}
{
vector <int> num;         //Vector to store integers
    num.push_back(1);         
    num.push_back(2);       
    num.push_back(3); 
    //**etc. till 24       
    for(int x=0; x<num.size(); x++) 
    {
     cout << num[x]/24 << " ";
}

another question which values should i be pushing into the
vector from my input file, the temperatures in themselves
or just the reference numbers as above? or...am i going
completely wrong about this which i feel i am... argh! some
things are so easy and yet some things are so hard.

Last edited by swordy06; Mar 26th, 2007 at 1:42 am.

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Re: Help with calculating avrg from input file.

Mar 26th, 2007

No... insert it here:

 Help with Code Tags 
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while (inFile) //End-ofFile Controlled Loop
        {
              // push_back 'ctemp' here
 
              outFile << "\t" << ref << "\t" << mydate << "\t" << Celsius(ctemp)
              << "°F" << endl << endl; // Write Record
              inFile >> ref >> mydate >> ctemp; // Read File
        }
while (inFile) //End-ofFile Controlled Loop
        {
              // push_back 'ctemp' here

              outFile << "\t" << ref << "\t" << mydate << "\t" << Celsius(ctemp)
              << "°F" << endl << endl; // Write Record
              inFile >> ref >> mydate >> ctemp; // Read File
        }

>which values should i be pushing into the vector from my input file, the temperatures in themselves
Yes, the temperatures. You don't need to worry about the reference numbers; vectors have their own way of referencing values. Remember, you want to calculate the average of the temperatures, so that's what you're going to need to store, not anything else.

Once you're out of the loop, create another one to calculate the sum of all the temperatures, and then divide this total by the number of temperatures, which ends up being your average.

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Re: Help with calculating avrg from input file.

Mar 26th, 2007

•

Originally Posted by joeprogrammer

>my problem is, that i have been trying to use a counter to display the average and im stumped
The problem is that you need to store the data in some sort of array -- preferably a vector, and then you can calculate the average.

Why? Go simple.
In this loop:

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
while (inFile) //End-ofFile Controlled Loop
{
    outFile << "\t" << ref << "\t" << mydate << "\t" << Celsius(ctemp)
            << "°F" << endl << endl; // Write Record
    inFile >> ref >> mydate >> ctemp; // Read File
}
while (inFile) //End-ofFile Controlled Loop
{
    outFile << "\t" << ref << "\t" << mydate << "\t" << Celsius(ctemp)
            << "°F" << endl << endl; // Write Record
    inFile >> ref >> mydate >> ctemp; // Read File
}

Simply add ctemp to a total counter and add 1 to a 'lines read' counter before your output. Then when you exit the loop, calculate total/lines. No need to store all the data unless you need it later in the program.

Last edited by WaltP; Mar 26th, 2007 at 3:55 am.

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Re: Help with calculating avrg from input file.

Mar 26th, 2007

>No need to store all the data unless you need it later in the program.
It's good to plan ahead. I prefer doing things harder the first time if it makes future options easier. Now say you want to add some extra features to the program using the data you collected, wouldn't it be way easier if you already had done the groundwork?

But I see your point, and perhaps it's better in this case to calculate the average on-the-spot, since this is just a homework assignment...

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Re: Help with calculating avrg from input file.

#10

Mar 27th, 2007

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Originally Posted by WaltP

Simply add ctemp to a total counter and add 1 to a 'lines read' counter before your output. Then when you exit the loop, calculate total/lines. No need to store all the data unless you need it later in the program.

sorry for replying so late, ive been kinda busy with other schoolwork,
so it would be something like this

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
 while (inFile) 
        {
 
              int total = ctemp;
              (total=1; total<25; total++)
              outFile << "\t" << ref << "\t" << mydate << "\t" << Celsius(ctemp)
              << "°F" << endl << endl; // Write Record
              inFile >> ref >> mydate >> ctemp; // Read File
        }
 while (inFile) 
        {

              int total = ctemp;
              (total=1; total<25; total++)
              outFile << "\t" << ref << "\t" << mydate << "\t" << Celsius(ctemp)
              << "°F" << endl << endl; // Write Record
              inFile >> ref >> mydate >> ctemp; // Read File
        }

where would i put the lines counter or how would i apply it to here??