/*
 * File:
 *   countstuff.c
 * Authors:
 *   Brian W. Kernighan
 *   Dennis M. Ritchie
 *   Samuel A. Rebelsky
 * Version:
 *   1.1 of 31 January 2003
 * Summary:
 *   Counts various kinds of input characters taken from standard input.
 *   Currently counts digit characters ('0' ... '9'), white space, and
 *     "everything else".
 * Citation:
 *   Closely based on an unnamed program on page 22 of K&R.
 */

/* +---------+--------------------------------------------------------
 * | Headers |
 * +---------+
 */

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

/* +------+-----------------------------------------------------------
 * | Main |
 * +------+
 */
main()
{
  int ch;	/* Temporary variable for input characters. */
  int i;	/* Counter variable for loops. */
  int nwhite;	/* The number of whitespace characters. */
  int ndigit[10];
		/* The number of each digit character.  ndigit[0]
		 * contains the number of '0' characters, ndigit[1]
		 * contains the number of '1' characters, and so
		 * on and so forth.
		 */
  int nother;	/* The number of "other" characters. */

  /* Initialize key variables. */
  nwhite = nother = 0;
  for (i = 0; i < 10; ++i)
    ndigit[i] = 0;
  
  /* Read input and count characters. */
  while ((ch = getchar()) != EOF) {
    /* If it's a digit, increment the approropiate counter. */
    if ((ch >= '0') && (ch <= '9'))
      ++ndigit[ch-'0'];
    /* If it's a whitespace character (space, newline, tab),
     * increment the whitespace counter. */
    else if ((ch == ' ') || (ch == '\n') || (ch == '\t'))
      ++nwhite;
    /* Otherwise, it's something else. */
    else
      ++nother;
  } /* while */

  /* Summarize data. */
  printf("digits: ");
  for (i = 0; i < 10; ++i)
    printf("'%c'=%d ", '0'+i, ndigit[i]);
  printf("\n");
  printf("white space = %d\n", nwhite);
  printf("other = %d\n", nother);

  /* Clean up. */
  exit(EXIT_SUCCESS);
} /* main */