推荐回答（3个）
pl文件是抄perl语言文件的源程序的扩展名。perl内部并不存在整数，在perl内部总是按照双精度浮点数的要求来保存数字并进行运算的。
C++中使用到的双精度浮点数（double）类型是在IEEE二进制浮点数算术标准（ANSI/IEEE Std 754-1985）中定义的。双精度浮点数（Double）用来表示带有小数部分的实数，一般用于计算机变成中定义变量，占用8个字节存储空间，其数值范围为-1.7E-308～1.7E+308，双精度浮点数最多有15或16位十进制有效数字。
扩展资料：
d=3.5（二进制11.1）的double形式为
0100 0000 0000 1100 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
40 0C 00 00 00 00 00 00
小尾方式为 00 00 00 00 00 00 0C 40
d=3.500000001DFBB0
.pl文件是perl语言文件的源程序的扩展名。
perl内部并不存在整数，在perl内部总是按照双精度浮点数的要求来保存数字并进行运算的。
如果要使perl支持unicode字符，需要添加 use utf8;
\l 将下一个字母转换为小写
\L 将它后面的所有字母都换为小写，直到\E为止
\u 将下一个字母转换为大写
\U 将它后面的所有字母都换为大写，直到\E为止
\Q 相当于把它到\E之间的非单词字符加上反斜杠
\E 结束\L、\U、\Q开始的作用范围
用Perl打开文件..具体怎么弄这个文件,我不大清楚..
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