Short program build help

[tycastill0]

Im having trouble starting or building this program for my c++ class pease help someone.

The program i need to run needs to open a file that contains a series of numbers reaads all the numbers from the file and calculates the following:

A) The number of numbers in the file

B) The sum of all the numbers in the file ( a running total )

C) The Average of all the numbers in the file

And displays all of these.

File name TopicD.cpp

[vlad from moscow]

Without testing:

#include <iostream>
#include <fstream>
#include <cstdlib>
 
int main()
{
   const char *name = "TopicD.cpp";
 
   std::ifstream input_file( name );
 
   if ( !input_file )
   {
      std::cerr << "Error: file " << name << " can not be opened" << std::endl;
      std::exit( 1 );
   }
 
   int sum = 0;
   int count = 0;
   int number;
 
   while ( input_file >> number ) sum += number, ++count;
 
   if ( count != 0 )
   {
      std::cout << "There are " << count << " numbers in the file" << std::endl;
      std::cout << "The sum of the numbers is " << sum << std::endl;
      std::cout << "The average of the numbers is " << sum / count << std::endl;
   }
 
   return 0;
}

[booradley60]

Watch out for integer division on line 27.

[vlad from moscow]

@booradley60
Watch out for integer division on line 27

What is the problem? Why the average can not be an integer number for a sequence of integers?

[Chervil]

Well if the input file contains

6 7 7 7 7

integer division gives the average as 6, which is misleading.

[tycastill0]

does the file that im opening have to be in a specific place?
or how does that work in this program? and the file name that im trying to open is called random.txt

[vlad from moscow]

@Chervil
Well if the input file contains
6 7 7 7 7
integer division gives the average as 6, which is misleading.

There is nothing misleading because you are dealing with integers.

[booradley60]

For median and mode I would agree with you, but the average could still have fractional data even if all the inputs are integers.

[vlad from moscow]

@booradley60
For median and mode I would agree with you, but the average could still have fractional data even if all the inputs are integers.

I do not argue because I do not see the subject of the discussion. I only see that you have some problems with integers. It is your problems not main. You personally can use a floating type but I prefered to use the integer type for the average of a sequence of integers.

[booradley60]

I only see that you have some problems with integers.

My problem with integers is that in many cases they cannot faithfully represent the actual value of the average of a sequence of integers.

It is your problems not main.

It is a problem to anyone who takes the word 'average' in this case to imply 'arithmetic mean'.

@tycastill0
You can try specifying the entire path to your file. Otherwise, the executable will look in certain directories depending on your environment.