Delphi: Delphi Gets character of the area code, enter any characters, it will be able to get the area code, the program runs screenshot shown above, to download the source code and see it yourself.

按要求生成指定位数的编号
........................\Project1.cfg
........................\Project1.dof
........................\Project1.dpr
........................\Project1.res
........................\Unit1.dcu
........................\Unit1.ddp
........................\Unit1.dfm
........................\Unit1.pas

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