Perl: You don't want to miss! -1-

Assalamo Alikom,

This post is about Perl, a well known programming language, and you don't want to ask me about it! I'm still a beginner doing the book execrices, didn't finish my assignments yet.

Better you go google "Perl": A {Scripting Dynamic} Langauge

This post is intended mainly to mention the first facts I've learned about Perl, it'll be all about the "print" function and some Strings and Numbers!

Print:

Here's the first picture of "print":

print "Hello... you know!";

This will print: Hello... you know!

Trivial, hah? even this:

print 'Hello... World!'

This will print: Hello...World!

What if we embeded this (scalar) string $myName inside the first version of print:

$myName = "Muhammad";

print "Hello $myName"

The second version?

$myName = "Muhammad";

print "Hello $myName"

This didn't automatically convert my string, good!

What about this:

print `Hello World!`;

These are different quote styles: `

This should output something like: Command not found ... Yeah, this print will execute what's inside!

So you may try something like:

print `cp file1 file2`;

("cp" is the copy command for bash)

What about Strings/Numbers?

Strings in Perl are First-Class Citizens! users shouldn't treat them as a character array!

$stringOne = "1";

print $stringOne + 1;

This prints "2" ;)

What about this:

$stringAddress = "8A";

print $stringAddress + 8;

This will print a warning! and then? ... it will print "16" which is 8+8

Perl starts parsing the string until it finds a non-numeric value it terminates but it keeps the valid piece. Notice that if the address string was something like: "A8" it would be converted to "0"!

Incrementing strings:

print ++"A0";

This will output: A1

You should give it a try yourself ;)

Hopefully I'll have more to say later on :)

Assalamo Alikom