K&R C Exercise 1-13 Solution

/*
 * Exercise 1-13 
 * print a histogram of the lengths of words in its input. It is easy to draw the 
 * histogram with the bars horizontal; a vertical orientation is more challenging.
 *
 * fduan, Dec. 10, 2011 
 */
#include <stdio.h>

#define IN		1
#define OUT		0
#define MAX_LEN	10

int main()
{
	int c, i, j, len, max_len, state;
	int len_word[MAX_LEN + 1] = { 0 };
	
	max_len = len = 0;
	state = OUT;

	while( ( c = getchar() ) != EOF ) 
	{
		if( c != ' ' && c != '\t' && c != '\n' )
		{
			state = IN;
			++len;
		}
		else if( state == IN )
		{
			state = OUT;
			++len_word[len];
			max_len = ( len > max_len ) ? len : max_len;
			len = 0;
		}
	}

	for( i = 1; i <= max_len; ++i )
	{
		printf( "%2d:\t", i );
		for( j = 0; j < len_word[i]; ++j )
			putchar( '*' );
		putchar( '\n' );
	}

	return 0;
}