Beginning Perl Third Edition PHẦN 6 pps
Beginning Perl Third Edition PHẦN 6 pps
... CHAPTER 8 ■ FILES AND DATA
2 06
$ perl ex2.pl file1.dat
it displays the contents of file1.dat. If invoked as
$ perl ex2.pl file2.dat file3.dat
it displays the contents ... optional third argument that is the character position from which it begins
looking for the substring. This invocation:
rindex('David Gilmour', 'i', 6)
starts at position 6 (the...
Beginning Linux Programming Third Edition phần 6 pps
... asterisk, as shown here:
SYMBOL FILE FUNCTION LINE
BASENID prog.c — *12 * 96 124 1 26 1 46 1 56 166
BINSIZE prog.c — *30 197 198 199 2 06
These utilities and others mentioned in this chapter may not be present ... name
18.5 0.10 0.10 866 4 0.01 0.03 _doscan [4]
18.5 0.20 0.10 mcount (60 )
14.8 0.28 0.08 43320 0.00 0.00 _number [5]
9.3 0.33 0.05 866 4 0.01 0.01 _format_arg [6]
7.4 0.37...
Beginning JavaScript Third Edition phần 6 docx
... various different directories. For example, if you visit
4 16
Chapter 11: Storing Information: Cookies
14_051511 ch11.qxp 4/13/07 6: 18 PM Page 4 16
can deal with it accordingly. If it’s an object, and ... that breaches JavaScript’s rules. If a syntax
3 96
Chapter 10: Common Mistakes, Debugging, and Error Handling
13_051511 ch10.qxp 4/13/07 6: 38 PM Page 3 96
When Firefox is reopened yo...
Beginning Perl Third Edition PHẦN 1 potx
... . . else 61
The unless Statement 64
Expression Modifiers 65
Using Short-Circuited Evaluation 65
Looping Constructs 66
The while Loop 66
while (<STDIN>) 67
Infinite Loops 69
Looping ... INSERT Command 358
The SELECT Command 361
Table Joins 367
Introduction to DBI 368
Installing DBI and the DBD::mysql 368
Connecting to the MySQL Database 369
Executing an SQL Query wi...
Beginning Perl Third Edition PHẦN 2 pdf
... should see something like this:
$ perl currency1.pl
49518 Yen is 547. 462 6 865 67 164 dollars
360 Yen is 3.980099502487 56 dollars
30510 Yen is 337.313432835821 dollars
$
First, we declare the ... equal to six? ", 6 == 6, "\n";
This will produce
$ perl bool1.pl
Is two equal to four?
OK, then, is six equal to six? 1
$
This output shows that in Perl, op...
Beginning Perl Third Edition PHẦN 3 docx
... case, reverse(1 6) produces (1, 2, 3, 4, 5, 6) and then reverses it to become (6, 5, 4,
3, 2, 1), and we see the list appear in that order:
Counting down (properly this time): 65 4321
Next we ... rounded toward 0, so
(1.4 6. 9)
would produce (1, 2, 3, 4, 5, 6) . There’s no problem with using negative numbers in ranges. For
example,
( -6 3)
produces the list ( -6, -5, -4, -3,...
Beginning Perl Third Edition PHẦN 4 pot
... defaults to shifting @_
$h = int($seconds/ (60 *60 ));
$seconds %= 60 *60 ;
$m = int($seconds /60 );
$seconds %= 60 ;
($h,$m,$seconds);
}
CHAPTER 6 ■ SUBROUTINES/FUNCTIONS
134
Now, ... there are 360 0 (60 *60 ) seconds in an hour, and so the number of hours
is the number of seconds divided by 360 0. However, that’ll give us a floating point number—if we
divided 366 0...
Beginning Perl Third Edition PHẦN 5 potx
... But in the Perl culture, munge is
not derogatory—being able to transform data, even if imperfectly, is one thing that Perl programmers aspire to.
CHAPTER 7 ■ REGULAR EXPRESSIONS
164
If ... this command is
$ dir | more
We can write Perl programs that pipe into programs (our Perl program will write into the pipe) or
pipe from programs (our Perl program will read from the p...
Beginning Perl Third Edition PHẦN 7 pot
... (@INC contains: /etc /perl /usr/local/lib /perl/ 5.10.0
/usr/local/share /perl/ 5.10.0 /usr/lib /perl5 /usr/share /perl5 /usr/lib /perl/ 5.10
/usr/share /perl/ 5.10 /usr/local/lib/site _perl .) at ./cantload.pl ... complete
list of all the modules in the Perl distribution, execute perldoc perlmodlib at a shell prompt.
CHAPTER 12 ■ MODULES
270
[
2,
4,
6
],
{
'...
Beginning Perl Third Edition PHẦN 8 pdf
... OBJECT-ORIENTED PERL
307
use warnings;
use strict;
use Person6;
print "In the beginning: ", Person6->headcount(), "\n";
my $object = Person6->new(
lastname ... (methods).
Perl makes object–oriented programming neat and simple:
• An object is a reference that has been blessed into a class.
• A class is an ordinary Perl package.
• A method is...
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