1 /* Write a program to print a histogram of the frequencies of
2  * different characters in its input. */
3 
4 #include <stdio.h>
5 #define CHARSIZE 256
6 
7 main()
8 {
9 	int histogram[CHARSIZE], c, maxfreq;
10 
11 	for (int i = 0; i < CHARSIZE; ++i)
12 		histogram[i] = 0;
13 
14 	maxfreq = 0;
15 
16 	while ((c = getchar()) != EOF) {
17 			++histogram[c];
18 	}
19 	for (int i = '0'; i <= '9'; ++i) {
20 		printf("%c: %6d\n", i, histogram[i]);
21 	}
22 	for (int i = 'A'; i <= 'Z'; ++i) {
23 		printf("%c: %6d\n", i, histogram[i]);
24 	}
25 	for (int i = 'a'; i <= 'z'; ++i) {
26 		printf("%c: %6d\n", i, histogram[i]);
27 	}
28 	/*
29 	++histogram[letters];
30 
31 	for (int i = 1; i <= MAXLENGTH; ++i) {
32 		printf("%2d: %5d", i, histogram[i]);
33 		for (int j = 0; j < histogram[i]; ++j) {
34 			printf("=");
35 		}
36 		printf("\n");
37 		
38 		maxfreq = (histogram[i] > maxfreq ? histogram[i] : maxfreq);
39 	}
40 	printf("\n\n");
41 	for (int h = maxfreq; h > 0; --h) {
42 		for (int i = 1; i <= MAXLENGTH; ++i) {
43 			if (histogram[i] >= h) {
44 				printf(" | ");
45 			} else {
46 				printf("   ");
47 			}
48 		}
49 		printf("\n");
50 	}
51 	for (int i = 1; i <= MAXLENGTH; ++i) {
52 		printf("===");
53 	}
54 	printf("\n");
55 	for (int i = 1; i <= MAXLENGTH; ++i) {
56 		printf("%2d ",i);
57 	}
58 	printf("\n");
59 	*/
60 }