Getting started with the Perl language

　　

Chapter II, scalar data

Scalar (scalar): numeric or string

Numbers are saved in the Dobule type, no integers, and can be inserted into the underline for easy reading

123456789 and 123_456_789 show the same effect.

Supports other binary integer variables, as well as inserting underscores for easy reading.

0377 #8进制, starting with 0, representing the decimal 255

0xFF #16进制, starting with 0x, representing decimal 255

0b11111111 #二进制, starting with 0b, representing the decimal 255

The string, which is a sequence of characters, has no length and can fill the entire memory slowly. Because you can use any character, you can create a scan or manipulate binary data.

Getting started with the Perl language