ex_1-13.c

   1 #include <stdio.h>
   2
   3 main()
   4 {
   5         int c, i, j, nwhite, nother, maxnum;
   6         int ndigit[10];
   7
   8         maxnum = 0;
   9         nwhite = nother = 0;
  10         for(i = 0; i < 10; i++)
  11                 ndigit[i] = 0;
  12
  13         while ((c = getchar()) != EOF)
  14                 if(c >= '0' && c <= '9')
  15                         ++ndigit[c-'0'];
  16                 else if (c == ' ' || c == '\n' || c == '\t')
  17                         ++nwhite;
  18                 else
  19                         ++nother;
  20
  21         /* print out histogram */
  22
  23         for(i = 0; i <= 10; ++i)
  24         {
  25                 if(ndigit[i] > maxnum) { maxnum = ndigit[i]; }
  26         }
  27
  28         for(i = 0; i < maxnum; ++i) // one row for each instance of number
  29         {
  30                 printf("%d\t|", maxnum-i); // print sidebar
  31                 for(j = 0; j <= 10; ++j) // one column for each number
  32                 {
  33                         if(ndigit[j] >= maxnum-i) { putchar('*'); } else { putchar(' '); }
  34                 }
  35                 printf("\n");
  36         }
  37
  38         printf("\t 0123456789\n");
  39
  40 }