Thread: text files in c++

i can read text files in c++, but how can i use the information

that is actually in the text files, which is just integers

and do calculations with them, ie find the mean.

i am finding it very difficult to find the solution to this, and to

acutally use the integers within the text file and use them for

calculations.

Any help will be greatly appreciated.

thanks


DungeonMaster

this is what i have of my code so far:
i've also included attachments of some of the txt files i am using
i would just like to know how i could use the integer values within the text files and actually get the mean values for them etc..

very very greatful for any help

Code:

#include <fstream>
#include <string>
#include <iostream>
#include <iomanip>
#include <cmath>
#include <cstdlib>
using namespace std;

int main()
{    int c;                                                           // open
    string str[20];                        // string array
    int i = 0, j = 0, last;                // counter variables
    ifstream myFile("figures1.txt");       // input file object
    if (! myFile)
    {                                                           // open
          cout << "Unable to open input file" << endl;
          return -1;
          }                                                     // close
          while (! myFile.eof())           // loop through data
          {                                                    // open
                if ((i+1) % 2 ==0) getline(myFile, str[i++]);
                else getline(myFile, str[i++], '\t');
                }                                              // close
                last = i;                  // last element #
                i = 0;
                while (i < last)           // display records
                {                                             // open
                      cout << "Choice Number:\t" << str[i++] << endl;
                      cout << "Company Name:\t"        << str[i++] << endl;
                     
                      }    myFile.close();                                   // close
                                    // close the file
                      cin >> c;

					  switch (c){

case 1: cout<< "you have selected company, Diago Plc\n"<< endl;
 
	{
	string str;
	ifstream myFile("Diago plc.txt");
	if (!myFile)					// Always test file open
	{
		cout << "Error opening output file" << endl;
		return -1;
	}
	while (! myFile.eof()) // Loop through lines
	{
		getline(myFile, str);
		cout << str << endl;
	}
	myFile.close();
	
}
	   break;
case 2: cout<< "you have selected company, Sabmiller Plc\n"<<endl;
	{
	string str;
	ifstream myFile("sabmiller plc.txt");
	if (!myFile)					// Always test file open
	{
		cout << "Error opening output file" << endl;
		return -1;
	}
	while (! myFile.eof()) // Loop through lines
	{
		getline(myFile, str);
		cout << str << endl;
	}
	myFile.close();
	
}
	break;
case 3: cout<< "you have selected company, Associated British Foods Plc\n"<<endl;
{
	string str;
	ifstream myFile("associated british foods plc.txt");
	if (!myFile)					// Always test file open
	{
		cout << "Error opening output file" << endl;
		return -1;
	}
	while (! myFile.eof()) // Loop through lines
	{
		getline(myFile, str);
		cout << str << endl;
	}
	myFile.close();
	
}
	break;
case 4: cout<< "you have selected company, Scottish and Newcastle Plc\n"<<endl;
	{
	string str;
	ifstream myFile("scottish and newcastle.txt");
	if (!myFile)					// Always test file open
	{
		cout << "Error opening output file" << endl;
		return -1;
	}
	while (! myFile.eof()) // Loop through lines
	{
		getline(myFile, str);
		cout << str << endl;
	}
	myFile.close();
	
}
	break;
case 5: cout<< "you have selected company, Tate and Lyle Plc\n"<<endl;
	{
	string str;
	ifstream myFile("tate and lyle.txt");
	if (!myFile)					// Always test file open
	{
		cout << "Error opening output file" << endl;
		return -1;
	}
	while (! myFile.eof()) // Loop through lines
	{
		getline(myFile, str);
		cout << str << endl;
	}
	myFile.close();
	
}
	break;
case 6: cout<< "you have selected company, Kerry Group Plc\n"<<endl;
	{
	string str;
	ifstream myFile("kerry group.txt");
	if (!myFile)					// Always test file open
	{
		cout << "Error opening output file" << endl;
		return -1;
	}
	while (! myFile.eof()) // Loop through lines
	{
		getline(myFile, str);
		cout << str << endl;
	}
	myFile.close();
	
}
	break;
default: cout << "you have not entered a valid choice"<<endl;
cout<<" please re-enter your choice"<<endl;
					  }
return 0;
                      }