How to split a string of only ten characters e.g.“12345*45688” into an array?

If you want to read something like that, especially if you want to evaluate mathematical expressions, you need more than just an array-splitter; you need a real parser. Doing it right requires a bit of compiler theory. I'd recommend you take a look at Let's Build A Compiler a tutorial that covers everything you'll need to know about expression parsing (and a bit more, since he's actually building a simple compiler) and makes it easy to understand.

All examples are in Turbo Pascal, so it should be easy for a Delphi coder to read.

Delphi XE has a SplitString function that does exactly what you need.

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