// 22.5HV2 Software Engineering II
// Unit 1 Exercise 1

#include <iostream.h>
#include <iomanip.h>
#include <fstream.h>

void func(float [], int n, float&, float&, float&);

int main(int argc, char *argv[])
{
   ifstream  ins;
   float     array[100], min, max, average;
   int       i=0, num;

   if ( argc!=2 ) {
      cerr << "USAGE: ex1 infile" << endl;
      return 1;
   }

   ins.open(argv[1]);
   if ( ins.fail() ) {
      cerr << "Error opening " << argv[1] << endl;
      return 1;
   }

   ins >> array[i];
   while ( !ins.eof() ) {  // test for end of file
      i++;
      ins >> array[i];
   }
   num = i;
   ins.close();

   if ( num>0 ) {  // Must check for empty file
      func(array,num,min,max,average);   
      cout << "Minimum value = " << min << endl;
      cout << "Maximum value = " << max << endl;
      cout << setprecision(3);
      cout << "Average value = " << average << endl;
   }
   else cout << "Empty file!" << endl;

   return 0;
}

void func(float array[], int n, float &min, float &max, float &avg) 
{
   int    i;
   float  sum = 0.0;

   sum = min = max = array[0];
   for (i=1;i<n;i++) {
      sum += array[i];
      if ( array[i] < min ) min = array[i];
      if ( array[i] > max ) max = array[i];
   }
   avg = sum/n;
}