/*-----------------------------------------------\
	|                                                |
	|  This program's intention is to store numbers  |
	|  on a user-defined interval in files named for |
	|  the number of prime factors they have.  Each  |
        |  number will be paired with its Phi-Stat.      |
	\_______________________________________________*/

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

int main()
{

/* Variable Declarations */

  FILE *fp;
  int working, starting_point, end_point, number, oldnumber, counter, outer, euler, ruler, barcounter;
  char filename[25];
  float interval;
  div_t temp;

/* Lower and Upper Bound Definitions */

  printf("Please enter a starting point: ");
  scanf("%d", &starting_point);
  printf("Please enter an end point: ");
  scanf("%d", &end_point);
  interval = (end_point - starting_point) / 10;

/* Status bar initialization */

  printf("<");
  ruler=(interval + 0.5);
  barcounter = 0;

/* Beginning Outer Loop Checking Each Number */

  for(outer = starting_point; outer <= end_point; outer++)
  { 
    working = outer;
    counter = 0;
    euler = outer;
    barcounter++;

/* Beginning Inner Loop Determining Factorability of Each Number */

    for(number = 2; number <= outer/2; number++)
    {
    temp = div(working, number);
    if (temp.rem == 0)
      {
      counter++; 
      working = working/number;
      if (oldnumber != number)
        {
        oldnumber = number;
        euler = (euler * (number - 1)) / (number);
        }
      number--;
      }
    }
  if (outer == working)
    {
    euler = outer-1;
    }

/* Deciding on a file name in which to store the resultant values */

  sprintf(filename, "factors_%d", counter);
  fp=fopen(filename, "a");
  fprintf(fp, "%9d%9d\n", outer, euler);
  fclose(fp);

/* This part, which is supposed to be a bar displaying the current state of completion of the program, 
Is behaving strangely.  It displays what I expected it to display, but it shows up only after execution 
has terminated, rendering it useless */

  if (barcounter == ruler)
    {
    printf("=%d", barcounter);
    barcounter = 0;
    }
  }
  printf("=>\n");
}