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Solution to the getword Problem

  /*
   * A Solution to the Warm-up Exercise
   */
  #include <assert.h>
  #include <ctype.h>
  #include <stdio.h>
  #include <string.h>

  int getword(char *word, int n)
      {
      int c;
      char *w = word;

      assert(n >= 2);
      while (isspace(c = fgetc(stdin)) && c != '\n')
          ;
      if (c != EOF)
          *w++ = c;
      if (!isalpha(c))
          {
          *w = '\0';
          return c;
          }
      while (isalnum(c = fgetc(stdin)))
          if (n > 0)
              {
              *w++ = c;
              --n;
              }
      ungetc(c, stdin);
      *w = '\0';
      return *word;
      }

  #define MAXLEN 10
  int length[MAXLEN] = { 0 };

  int main()
      {
      int i, n;
      int lines = 0;
      char word[MAXLEN];

      while (getword(word, MAXLEN) != EOF)
         if (isalpha(word[0]))
            {
            n = (n = strlen(word)) < MAXLEN ? n - 1 : MAXLEN - 1;
            ++length[n];
            }
      for (i = 0; i < MAXLEN; ++i)
         printf("%d words of length %d%s\n", length[i],
             i + 1, i < MAXLEN - 1 ? "" : " or more");
     return 0;
     }

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