我正在阅读K&R中的1.9节,我不明白下面实现的代码中EOF的使用
#include <stdio.h>
#define MAXLINE 1000 /* maximum input line length */
int mymygetline(char line[], int maxline);
void copy(char to[], char from[]);
/* print the longest input line */
int main()
{
int len; /* current line length */
int max; /* maximum length seen so far */
char line[MAXLINE]; /* current input line */
char longest[MAXLINE]; /* longest line saved here */
max = 0;
while ((len = mymygetline(line, MAXLINE)) > 0) {
if (len > max) {
max = len;
copy(longest, line);
}
}
if (max > 0) /* there was a line */
printf("%s", longest);
return 0;
}
/* mymygetline: read a line into s, return length */
int mymygetline(char s[], int lim)
{
int c, i;
for (i = 0; i < lim - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
s[i] = c;
if (c == '\n') {
s[i] = c;
++i;
}
s[i] = '\0';
return i;
}
/* copy: copy 'from' into 'to'; assume to is big enough */
void copy(char to[], char from[])
{
int i;
i = 0;
while ((to[i] = from[i]) != '\0')
++i;
}
我尝试过的:
问题: