Lesson 1.1: Hello, world

Lesson 1.10:
External variables and scopes (1/2)
Programming in C
Prof. Dr. Eike Best
Dr. Elke Wilkeit
September 28, 2002
1 #include
2 #define MAXLINE 1000 /* maximum input line size */
3
4 int cur_max; /* maximum length seen so far */
5 char cur_line[MAXLINE]; /* current input line */
6 char longest[MAXLINE]; /* longest line saved here */
7
8 int getline(void);
9 void copy(void);
10
11 /* print longest input line; specialised version */
12 main()
13 {
14 int cur_len; /* current line length */
15 extern int cur_max;
16 extern char cur_line[];
17 extern char longest[];
18
19 cur_max = 0;
20 while ((cur_len = getline()) > 0)
21 if (cur_len > cur_max) {
22 cur_max = cur_len;
23 copy();
24 }
25 if (cur_max > 0) /* there was a line */
26 printf("%s", longest);
27 return 0;
28 }
29
30 /* getline: specialised version */
31 int getline(void)
32 {
33 int c, i;
34 extern char cur_line[];
35
36 for (i=0; i