Write a program that reads in the file numbers.txt
and prints out the average of the numbers there - for 
the moment let's force ourselves to do the average 
computation *after* we've read in the whole file.  
The file numbers .txt looks like this:

N = 3

I.e. there's a header that tells you how many numbers
are in the file, and then you get all the numbers.
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
  // Open input file, read header, get N = # of int's
  ifstream IN("numbers.txt");
  char c;
  int N;
  string s;
  IN >> c >> c >> N >> s;

  // Create array A and read N int's from input
  int *A = new int[N];
  for(int i = 0; i < N; i++)
    IN >> A[i];

  // Cycle through array summing all the elements
  int sum = 0;
  for(int j = 0; j < N; j++)
    sum = sum + A[j];
  // Print out the average
  cout << "The average of the values is "
       << double(sum)/N << endl;

  return 0;