eof函数查看最后一次读文件操作是否为文件最后一个记录，如果是，则返回非零值，如果文件还有内容，返回零。
    一般情况下，对eof的调用不加括号，因为eof和eof()是等效的，但与<>操作符一起使用时，eof和eof()就不同了。现在我们来创建两个文件，分别叫做file1和file2。file1的内容为：
     This is a line from the first file.
     Here is the last line of the first file.
    file2的内容为：
     This is a line from the second and last file.
     Here is the last line of the last file.
    下面就来看一下eof和eof()的区别，第一个程序为：

1: #!/usr/local/bin/perl
2:
3: while ($line = <>) {
4: print ($line);
5: if (eof) {
6: print ("-- end of current file --\n");
7: }
8: }

运行结果如下：

$ program file1 file2
This is a line from the first file.
Here is the last line of the first file.
-- end of current file --
This is a line from the second and last file.
Here is the last line of the last file.
-- end of current file --
$

下面把eof改为eof()，第二个程序为：

1: #!/usr/local/bin/perl
2:
3: while ($line = <>) {
4: print ($line);
5: if (eof()) {
6: print ("-- end of output --\n");
7: }
8: }

运行结果如下：

$ program file1 file2
This is a line from the first file.
Here is the last line of the first file.
This is a line from the second and last file.
Here is the last line of the last file.
-- end of output --$

这时，只有所有文件都读过了，eof()才返回真，如果只是多个文件中前几个的末尾，返回值为假，因为还有要读取的输入。

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eof函数

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