wc.c

/* Count words, lines and characters.*/

/*
  The number of lines is just the number of newline chars. Every
  character, including newline is counter as a character. EOF is not a
  character.

  I use a structure design rather than an IN/OUT state flag.
  
  A sequence of chars not including blank, tab or newline is a
  'word'. A substring of a word is not itself a word.

      input = (special | word)*
      special = blank | tab | newline
      word = char+ 

 */

#include<stdio.h>

int
main(int argc, char *argv[]) {
  int ch;
  int nline, nword, nchar;

  nline = nword = nchar = 0;
  ch = getchar();
  while (ch != EOF) {
    nchar++;
    switch (ch) {
    case '\n':
      nline++;
      ch = getchar();
      break;
    case ' ': case '\t':
      ch = getchar();
      break;
    default:
      nword++;
      ch = getchar();
      while (ch != EOF && ch != ' ' && ch != '\t' && ch != '\n') {
	nchar++;
	ch = getchar();
      }
      break;
    }
  }
  printf("%d %d %d\n", nline, nword, nchar);
  return 0;
}