usr/lib/learn/C/L14.2b

#print
Write a program which counts the number of five letter
words in its input (define a word as anything between
blanks, tabs or newlines).  Compile and run it, then type "ready".
Note that all that is wanted is the total number of
five letter words - nothing was said about distinct
words.  Just count the number of times exactly five
characters appear between spaces.
#once #create Ref
This is a passage of text which contains
exactly twelve words of five letters.
Words may appear at the start or at the final
part of a line.  Other words show up in
the middle.  Avoid counting seven or eight letters
but every five must be noted.
#user
a.out <Ref >xxx
grep 12 xxx >/dev/null
#succeed
/*      one way to count five letter words */
 \b#include <stdio.h>

main()
{
        int since, wdnum, c;

        since = 0;
        while ((c=getchar()) != EOF) {
                if (c == ' ' || c == '\t' || c == '\n') {
                        if (since == 5)
                                wdnum++;
                        since = 0;
                }
                else
                        since++;
        }
        printf("%d\n", wdnum);
}
#log
#next
15.1a 10