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Practical Getting started with Perl. Bioinformatics. Dr. Aladdin Hamwieh Khalid Al- shamaa Abdulqader Jighly. Aleppo University Faculty of technical engineering Department of Biotechnology. 2010-2011. Basics. Command Line Text File Inputs & Outputs Variables ($) " " and \' \'

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bioinformatics

Practical

  • Getting started with Perl

Bioinformatics

Dr. Aladdin Hamwieh Khalid Al-shamaa

Abdulqader Jighly

Aleppo University

Faculty of technical engineering

Department of Biotechnology

2010-2011

basics
Basics
  • Command Line
  • Text File
  • Inputs & Outputs
  • Variables ($)
  • " " and \' \'
  • New Line (;)
  • Comments (#)
slide3

First Code

# first test

print "hi everybody! \n";

print ‘Your name is:\';

$name = <STDIN>;

print "Hi $v";

exit 0;

basic arithmetic operators
Basic arithmetic operators
  • Operator Function

+ Addition

- Subtraction

* Multiplication

/ Division

% Modulus (remainder)

** Exponent (to the power of)

++ Increment

-- Decrement

basic arithmetic operators1
Basic arithmetic operators
  • $v = 4;
  • $a = 2 + 3;
  • print "\$a = \$a \n";
  • $a = $a -1;
  • $a -= 1;
  • $a--;
  • print "$a \n";
  • $x = 2 + 3;
  • print \'\$x = $x \n\';
slide6
Note

12/3*4=16

BUT

12/(4*3)=1

order of precedence
order of precedence

Operator

**

/

*

%

+

-

training
Training
  • Input:
    • n
  • Output:
    • X
homework
Homework

X

  • Inputs:
    • Height (X)
    • Width (Y)
  • Outputs:
    • Perimeter
    • Area

Y

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