ex_1-14.c

   1 #include <stdio.h>
   2 #include <limits.h>
   3
   4 main ()
   5 {
   6   int c, i, j, nwhite, nother, maxnum;
   7   int ndigit[CHAR_MAX] = { 0 };
   8
   9   maxnum = 0;
  10   nwhite = nother = 0;
  11
  12   for (i = 0; i < 10; i++)
  13     ndigit[i] = 0;
  14
  15   while ((c = getchar ()) != EOF)
  16     if (c > CHAR_MAX)
  17       {                         /* chars outside CHAR_MAX skipped */
  18       }
  19     else
  20       {
  21         ++ndigit[c];
  22       }
  23
  24   /* print out histogram */
  25   for (i = 0; i <= CHAR_MAX; ++i)       // find maximim count to determine graph height
  26     if (ndigit[i] > maxnum)
  27       {
  28         maxnum = ndigit[i];
  29       }
  30
  31   for (i = 0; i < maxnum; ++i)  // one row for each instance of number
  32     {
  33       printf ("\n");
  34       printf ("%d\t|", maxnum - i);     // print sidebar
  35       for (j = 0; j <= CHAR_MAX; ++j)   // one column for each number
  36         {
  37           if (ndigit[j] > 0)    // skip chars not represented in file
  38             if (ndigit[j] >= maxnum - i)
  39               {
  40                 putchar ('*');
  41               }
  42             else
  43               {
  44                 putchar (' ');
  45               }
  46         }
  47     }
  48
  49   /* print vertically ascii value of char printed */
  50   printf ("\n\t ");
  51   for (i = 0; i <= CHAR_MAX; ++i)
  52     {
  53       if (ndigit[i] > 0)
  54         {
  55           printf ("%d", i / 100);
  56         }
  57     }
  58   printf ("\n\t ");
  59   for (i = 0; i <= CHAR_MAX; ++i)
  60     {
  61       if (ndigit[i] > 0)
  62         {
  63           printf ("%d", (i - (100 * (i / 100))) / 10);
  64         }
  65     }
  66   printf ("\n\t ");
  67   for (i = 0; i <= CHAR_MAX; ++i)
  68     {
  69       if (ndigit[i] > 0)
  70         {
  71           printf ("%d", i - (10 * (i / 10)));
  72         }
  73     }
  74   printf ("\n");
  75 }