1 /*
2  * 1-23. Write a program to remove all comments from a C program. Don't forget to handle quoted strings and character constants properly. C comments do not nest.
3  */
4 
5 #include <stdio.h>
6 #define WIDTH 80
7 #define TABSTOP 8
8 #define BEGINSLASH 0
9 #define COMMENT 1
10 #define ENDSTAR 2
11 #define NOTCOMMENT 3
12 #define QUOTE 4
13 
14 int strln(char s[]);
15 void copy(char to[], char from[]);
16 
17 main()
18 {
19 	int c;
20 	int comment = NOTCOMMENT;
21 	while ((c = getchar())!=EOF) {
22 		if (comment == BEGINSLASH) {
23 			if (c == '*') {
24 				comment = COMMENT;
25 			} else {
26 				printf("/");
27 				if (c != '/') {
28 					comment = NOTCOMMENT;
29 				}
30 			}
31 		} else if (comment == COMMENT) {
32 			if (c == '*') {
33 				comment = ENDSTAR;
34 			}
35 		} else if (comment == ENDSTAR) {
36 			if (c == '/') {
37 				comment = NOTCOMMENT;
38 			} else if (c != '*') {
39 				comment = COMMENT;
40 			}
41 		} else if (comment == NOTCOMMENT) {
42 			if (c == '/') {
43 				comment = BEGINSLASH;
44 			} else {
45 				printf("%c", c);
46 			}
47 		}
48 	}
49 }
50 int strln(char s[])
51 {
52 	int i;
53 	for (i=0; s[i] != '\0'; ++i)
54 		;
55 	return i;
56 }
57 void copy(char to[], char from[])
58 {
59 	int i;
60 	i = 0;
61 	while ((to[i] = from[i]) != '\0')
62 		++i;
63 }