1 /* Write a program to print a histogram of the lengths of words in
2  * its input. It is easy to draw the histogram with the bars horizontal;
3  * a vertical orientation is more challenging. */
4 
5 #include <stdio.h>
6 #define MAXLENGTH 20
7 
8 main()
9 {
10 	int histogram[MAXLENGTH+1], letters, c, maxfreq;
11 
12 	for (int i = 1; i <= MAXLENGTH; ++i)
13 		histogram[i] = 0;
14 	letters = 0;
15 	maxfreq = 0;
16 
17 	while ((c = getchar()) != EOF) {
18 		if (c == ' ' || c == '\t' || c == '\n') {
19 			++histogram[letters];
20 			letters = 0;
21 		} else {
22 			++letters;
23 		}
24 	}
25 	++histogram[letters];
26 
27 	for (int i = 1; i <= MAXLENGTH; ++i) {
28 		printf("%2d: %5d", i, histogram[i]);
29 		for (int j = 0; j < histogram[i]; ++j) {
30 			printf("=");
31 		}
32 		printf("\n");
33 		
34 		maxfreq = (histogram[i] > maxfreq ? histogram[i] : maxfreq);
35 	}
36 	printf("\n\n");
37 	for (int h = maxfreq; h > 0; --h) {
38 		for (int i = 1; i <= MAXLENGTH; ++i) {
39 			if (histogram[i] >= h) {
40 				printf(" | ");
41 			} else {
42 				printf("   ");
43 			}
44 		}
45 		printf("\n");
46 	}
47 	for (int i = 1; i <= MAXLENGTH; ++i) {
48 		printf("===");
49 	}
50 	printf("\n");
51 	for (int i = 1; i <= MAXLENGTH; ++i) {
52 		printf("%2d ",i);
53 	}
54 	printf("\n");
55 }