Perl:Programming Tutorial

Perl:Top Ten Tips

Hello World

Convert to Number

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Sum an Array

Count 0 to 9

Hash Table

Regular Expression

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Define a Class

An introduction to computer programming using Java. Comprising

• Tutorials which present problems and their solutions.
• How to... guides to completing common tasks.
• Assessments graded problems with solutions.

An Example: drawing the French tricolour

You can create images using Perl and the Image Magic Library. The first tutorial Flags looks at drawing flags of the world, from simple flags such as Libya to more complicated flags such as the Stars and Stripes of the USA.

Notice that the blue rectangle is at (0,0), it is 50 wide and 100 deep so the commands to draw the blue rectangle are:

$g->filledRectangle(0,0, 50,100,
      $g->colorAllocate(0,0,255));

.

sub drawFlag{ my ($g) = @_; my $red = $g->colorAllocate(255,0,0); my $white= $g->colorAllocate(255,255,255); my $blue = $g->colorAllocate(0,0,255); $g->filledRectangle( 0,0, 50,100,$blue); $g->filledRectangle( 50,0,100,100,$white); $g->filledRectangle(100,0,150,100,$red); }

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