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The road is even, but human choose path.

if someone define a class like this , Why doesn't he just use a namespace ?

Yes. wikipedia. thank you .

I lost in the question of "lost precision" , and I am looking for some essential reasons.
thank you .

A computer language , some concepts , theorys.

Compiler convert the computer language source code to machine code. It implement the computer language concept.

Computer language has its...