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Computer science
Languages, etc.
Overview
• For web-applications (HTML, JS)– Designing languages (HMTL, CSS)– Server Languages (PHP, ASP)– Extensions
• For windows applications (C++,VB, C#)– Unmanaged applications– Managed applications
• Others…
Web-applications
• HTML• CSS• Java Script• Visual Basic Script• XAML• PHP• ASP, ASP.NET• Microsoft Silverlight (VB, C#)• Adobe Flash (Action script)
HTML, CSS, Java Script
• HTML – “hypertext markup language” standard format of writing a webpage.
• CSS – “cascading style sheet”. Describes the tags. It controls layout of multiple Web pages at once.
• Java Script – performs an event. Makes a page alive.
Designing languages
PHP, ASP, ASP.NET
• PHP – “hypertext preprocessor”.
• ASP – “active server script”
• ASP.NET – built on CLR. Therefore supports .NET languages.
Server languages
Silverlight and Flash
• In order to run an application made by these, you need a plug-in for the web browser
• Microsoft Silverlight – supports VB, C#. • Adobe Flash – supports Action Script.
Extensive languages
XAML
• XAML – “Extensible Application Markup Language”. It is extended XML developed by Microsoft.
• One usage is to write a layout for applications.
• XML – similar to html, but does not require specific tags; you define them.
Application design
Windows Applications
• C/C++
• Microsoft .NET Framework work – consist of CLR and a class library– Visual C#– Visual Basic– Visual F#
C/C++
• Produces unmanaged code (native CPU code)• C was develop 1979, and has been used since
then.
Microsoft .NET Framework
• All languages that target CLR may use almost all features in .NET Class Library.
• A language that targets CLR may only use a subset of the features that are available in CLR.
• All applications are usually managed. They contain metadata, etc.
• When you run an application of that kind, the JIT compiler compiles the IL code.
CLR – common language runtime
Examples from different languages
• HTML• CSS• PHP• C++• Visual C#• Visual Basic• Visual F#
HTMLhead
body
<html>
<head><title>Welcome!</title></head>
<body><p>Hello World</p></body>
</html>
CSS<html><head><style type="text/css">.red{ color:red;}.blue{ color:blue;}</style></head><body><p class="red">Red</p><p class="blue">Blue</p></body></html>
PHP [on the server]
<html><head></head><body><?php echo "Hello World"; ?></body></html>
PHP [sent to target machine]
<html><head></head><body>Hello World</body></html>
C++
Visual C#
Visual Basic
