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Can I get a yearly sales-figure over the Internet (sales/ transactions/ buyings taking place over the Internet) and in what categories like softwares, books, services (what services ?) etc. <br />
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Can you give URLs on these issues ?
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Can I get a yearly sales-figure over the Internet (sales/ transactions/ buyings taking place over the Internet) and in what categories like softwares, books, services (what services ?) etc. 

Can you give URLs on these issues ?

Sales Over Internet.

Programming theory deals with the design, implementation, analysis, characterization, and classification of programming languages and their individual features, along with introductory programming concepts like program structure, variable declaration and conditional and looping constructs. Sub-disciplines include the formal semantics of programming languages, type theory, program analysis and transformation, comparative programming language analysis, metaprogramming, domain-specific languages, compiler construction and run-time systems.

Programming Theory

Programming includes both the specifics of the language you’re using, like Visual Basic, .NET, Java and others, but also the best practices in user experience and interfaces and the management of projects, version control and development. Other programming topics are related to web and cloud development and system and hardware programming.