1 5dc21454 2023-07-14 jrmu /* Write a program to print a histogram of the frequencies of
 2 5dc21454 2023-07-14 jrmu  * different characters in its input. */
 3 5dc21454 2023-07-14 jrmu 
 4 5dc21454 2023-07-14 jrmu #include <stdio.h>
 5 5dc21454 2023-07-14 jrmu #define CHARSIZE 256
 6 5dc21454 2023-07-14 jrmu 
 7 5dc21454 2023-07-14 jrmu main()
 8 5dc21454 2023-07-14 jrmu {
 9 5dc21454 2023-07-14 jrmu 	int histogram[CHARSIZE], c, maxfreq;
10 5dc21454 2023-07-14 jrmu 
11 5dc21454 2023-07-14 jrmu 	for (int i = 0; i < CHARSIZE; ++i)
12 5dc21454 2023-07-14 jrmu 		histogram[i] = 0;
13 5dc21454 2023-07-14 jrmu 
14 5dc21454 2023-07-14 jrmu 	maxfreq = 0;
15 5dc21454 2023-07-14 jrmu 
16 5dc21454 2023-07-14 jrmu 	while ((c = getchar()) != EOF) {
17 5dc21454 2023-07-14 jrmu 			++histogram[c];
18 5dc21454 2023-07-14 jrmu 	}
19 5dc21454 2023-07-14 jrmu 	for (int i = '0'; i <= '9'; ++i) {
20 5dc21454 2023-07-14 jrmu 		printf("%c: %6d\n", i, histogram[i]);
21 5dc21454 2023-07-14 jrmu 	}
22 5dc21454 2023-07-14 jrmu 	for (int i = 'A'; i <= 'Z'; ++i) {
23 5dc21454 2023-07-14 jrmu 		printf("%c: %6d\n", i, histogram[i]);
24 5dc21454 2023-07-14 jrmu 	}
25 5dc21454 2023-07-14 jrmu 	for (int i = 'a'; i <= 'z'; ++i) {
26 5dc21454 2023-07-14 jrmu 		printf("%c: %6d\n", i, histogram[i]);
27 5dc21454 2023-07-14 jrmu 	}
28 5dc21454 2023-07-14 jrmu 	/*
29 5dc21454 2023-07-14 jrmu 	++histogram[letters];
30 5dc21454 2023-07-14 jrmu 
31 5dc21454 2023-07-14 jrmu 	for (int i = 1; i <= MAXLENGTH; ++i) {
32 5dc21454 2023-07-14 jrmu 		printf("%2d: %5d", i, histogram[i]);
33 5dc21454 2023-07-14 jrmu 		for (int j = 0; j < histogram[i]; ++j) {
34 5dc21454 2023-07-14 jrmu 			printf("=");
35 5dc21454 2023-07-14 jrmu 		}
36 5dc21454 2023-07-14 jrmu 		printf("\n");
37 5dc21454 2023-07-14 jrmu 		
38 5dc21454 2023-07-14 jrmu 		maxfreq = (histogram[i] > maxfreq ? histogram[i] : maxfreq);
39 5dc21454 2023-07-14 jrmu 	}
40 5dc21454 2023-07-14 jrmu 	printf("\n\n");
41 5dc21454 2023-07-14 jrmu 	for (int h = maxfreq; h > 0; --h) {
42 5dc21454 2023-07-14 jrmu 		for (int i = 1; i <= MAXLENGTH; ++i) {
43 5dc21454 2023-07-14 jrmu 			if (histogram[i] >= h) {
44 5dc21454 2023-07-14 jrmu 				printf(" | ");
45 5dc21454 2023-07-14 jrmu 			} else {
46 5dc21454 2023-07-14 jrmu 				printf("   ");
47 5dc21454 2023-07-14 jrmu 			}
48 5dc21454 2023-07-14 jrmu 		}
49 5dc21454 2023-07-14 jrmu 		printf("\n");
50 5dc21454 2023-07-14 jrmu 	}
51 5dc21454 2023-07-14 jrmu 	for (int i = 1; i <= MAXLENGTH; ++i) {
52 5dc21454 2023-07-14 jrmu 		printf("===");
53 5dc21454 2023-07-14 jrmu 	}
54 5dc21454 2023-07-14 jrmu 	printf("\n");
55 5dc21454 2023-07-14 jrmu 	for (int i = 1; i <= MAXLENGTH; ++i) {
56 5dc21454 2023-07-14 jrmu 		printf("%2d ",i);
57 5dc21454 2023-07-14 jrmu 	}
58 5dc21454 2023-07-14 jrmu 	printf("\n");
59 5dc21454 2023-07-14 jrmu 	*/
60 5dc21454 2023-07-14 jrmu }