Sol6hw3b 

1) Using the editor write  and save a file xxxxdata.txt which looks like this:
  78.3
  59.5
  89.2
  72.5
  95.3
 100.0
 This file contains the scores of 6 students in a quiz.
  ________________________________________________________________

2) Write and save in a file named xxxxpe2.cpp   a C++  program which consists
   of a main function and a function named   stat.
   The main function should:
a) Read the scores from the data file into an array scores[6].
b) Use the function
          void stat ( float scores[],  float& xbar,   float& x2bar )
   to locate and return the average of the scores and the average of the
   squares of the  scores.
c) Print to the screen xbar and x2bar..

  _________________________________________________________________
 
#include<iostream.h>                                       //    5 pts
#include<fstream.h>

void stat( float scores[],  float& xbar, float& x2bar);    //    5 pts

main( )                                                    //    5 pts
{                                      // structure of main and declarations
  float scores[6];
  float xbar, x2bar;
  int   k;

  ifstream table("jyk0data.txt", ios:: in);                //   10 pts

  for( k = 0 ; k <= 5  ; k++)                              //   15 pts
  table >> scores[k];

  stat( scores, xbar, x2bar);                             //    10 pts

  cout << "\n\n  the average score is: " << xbar << endl;    // 10 pts
  cout << "\n\n  the average of the squares of the scores is: " << x2bar<< endl;

  cout<<"\n\n  enter e ( exit) to terminate    ";          //    5 pts
  char hold;
  cin >> hold;
}

void stat( float scores[],  float& xbar, float& x2bar)    //   5 pts
{
  float sum1 = 0.0;                                       //   5 pts
  float sum2 = 0.0;
  int k;



  for ( k=0; k<= 5; k++)                                 //     15 pts
  {
    sum1 += scores[k];
    sum2 += scores[k] * scores[k];
   }

  xbar = sum1 / 6 ;                                     //      5 pts
  x2bar = sum2 / 6;

}


/*    THE DATA FILE IS:

78.3
59.5
89.2
72.5
95.3
100.0

This file contains the scores of 6 students in a quiz

    THE OUTPUT IS:



  the average score is: 82.4667


  the average of the squares of the scores is: 6994.35


  enter e ( exit) to terminate


    
*/