# include <stdlib.h>
# include <stdio.h>
# include <time.h>

int main ( int argc, char *argv[] );
double cpu_time ( void );

/******************************************************************************/

int main ( int argc, char *argv[] )

/******************************************************************************/
/*
  Purpose:

    MAIN is the main program for SUM_MILLION.

  Discussion:

    SUM_MILLION is a sketch of a program to generate the numbers
    from 1 to 1,000,000, add them, and print the result.

    This program is only a sketch.  Your job is to finish it,
    debug it, and get it to run.
*/
{
# define N 1000000

  double ctime;
  double ctime1;
  double ctime2;
  double error;
  double exact = 500000500000.0;
  int flops;
  int i;
  double mflops;
  double total;
  double x[N];

  printf ( "\n" );
  printf ( "SUM_MILLION:\n" );
  printf ( "  C version\n" );
  printf ( "\n" );
  printf ( "  Task: add the numbers from 1 to %d.\n", N );
/*
  Step 1:
  Load the array X with the values.
*/
  for ( i = 0; i < N; i++ )
  {
    x[i] = i + 1;
  }
/*
  Step 2:
  Start the clock.
  Add up the entries in X.
  Stop the clock.
  Compute elapsed CPU time;
  Set the number of FLOPs.
  Compute the MFLOPS rate.
  Compute the error.
*/

  MISSING CODE

/*
  Step 3:
  Print results.
*/
  printf ( "\n" );
  printf ( "  Total =     %f\n", total );
  printf ( "  Error =     %f\n", error );
  printf ( "  CPU time =  %f\n", ctime );
  printf ( "  MegaFLOPS = %f\n", mflops );

  return 0;
# undef N
}
/*******************************************************************************/

double cpu_time ( void )

/*******************************************************************************/
/*
  Purpose:
 
    CPU_TIME reports the total CPU time for a program.

  Modified:

    27 September 2005

  Author:

    John Burkardt

  Parameters:

    Output, double CPU_TIME, the current total elapsed CPU time in second.
*/
{
  double value;

  value = ( double ) clock ( ) / ( double ) CLOCKS_PER_SEC;

  return value;
}