L-6 MCS 275 Mon 22 Jan 2001

/* MCS 275 L-6 Mon 22 Jan 2001 : counting and storing words on line */

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

#define  MAXLEN  80    /* maximum #characters in string */

int read_line (char s[]);
/* Reads a line of characters (until user hits enter).
   The string read is in "s" and the function returns the number
   "n" of characters in the string, i.e.: s[n] == '\0' (See L-5) */
int count_words (char s[]);
/* returns the number of words on the line */
int words_count (char s[]);
/* returns the number of words on a line, without using "isspace()" */
int store_words (char s[], char *w[]);
/* stores the words in the string s in w, the integer on return is
   the number of words in w */

int main()
{
   char line[MAXLEN];
   char* words[MAXLEN];
   int i,n,m;

   printf("Give a line (< %d characters) : ", MAXLEN);
   n = read_line(line);
   printf("Your line is :\n     \"%s\" \n", line);
   m = count_words(line);
   printf("There are %d characters and %d words on this line\n", n,m);
   m = words_count(line);
   printf("The second word count : %d\n",m);
   m = store_words(line,words);
   printf("The words on the line are :\n");
   for (i=0; i < m; i++)
     printf("   %s\n",words[i]);
   printf("The words in backward order on the line:\n");
   for (i=m-1; i>=0; i--)
     printf("%s ", words[i]);
   printf("\n");
   return 0;
}

int read_line (char s[])
{
  int c,i;
  for (i=0; (c=getchar()) != EOF && c != '\n' && i < MAXLEN; ++i)
    s[i] = c;
  s[i] = '\0';
  return i;
}

int count_words (char s[])      /* count words with "isspace()" */
{
   int i=0;
   int cnt=0;
   while (s[i] != '\0')
   {
      while (isspace(s[i])) ++i;                        /* skip spaces */
      if (s[i] != '\0')
      {
         ++cnt;                                         /* found new word */
         while (!isspace(s[i]) && s[i] != '\0') ++i;    /* skip word */
      }
   }
   return cnt;
}

int words_count (char s[])     /* count words without "isspace()" */
{
   int i=0;
   int cnt=0;
   while (s[i] != '\0')
   {
      while (s[i] == ' ') ++i;                         /* skip spaces */
      if (s[i] != '\0')
      {
         ++cnt;                                        /* found new word */
         while ((s[i] != ' ') && s[i] != '\0') ++i;    /* skip word */
      }
   }
   return cnt;
}

int store_words (char s[], char *w[])
{
   int i=0;
   int cnt=0;
   int ind;

   while (s[i] != '\0')
   {
      while (s[i] == ' ') ++i;                        /* skip spaces */
      if (s[i] != '\0')
      {
         w[cnt] = calloc(MAXLEN,sizeof(char));        /* store word */
         ind = 0;
         while ((s[i] != ' ') && s[i] != '\0')
            w[cnt][ind++] = s[i++];
         w[cnt][ind] = '\0';
         ++cnt;                                       /* augment counter */
      }
   }
   return cnt;
}