练习1-17 编写一个程序，打印长度大于80个字符的所有输入行.

依然是看答案

 1 #include <stdio.h>
 2 #define MAXLINE 1000 //允许输入行的最大长度
 3 #define LONGLINE 80
 4 
 5 int getline(char line[], int maxline);
 6 
 7 // print lines longer than LONGLINE
 8 main()
 9 {
10 int len;
11 char line[MAXLINE];
12 
13 while((len - getline(line, MAXLINE)) > 0)
14 if(len > LONGLINE)
15 printf("%S", line);
16 return 0;
17 
18 }
19 
20 int getline(char s[], int lim)
21 {
22 int c, i, j;
23 j = 0;
24 for(i = 0; (c = getchar()) != EOF && c != '\n'; ++i)
25 if(i < lim - 2)
26 {
27 s[j] = c;
28 ++j;
29 }
30 if(c == '\n'){
31 s[j] = c;
32 ++j;
33 ++i;
34 }
35 s[j] = '\0';
36 return i;
37 }

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