c++ - Why do cin and cout use << and >> -

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possible duplicate:
why bitwise shifts (<< , >>) used cout , cin?

i understand cout , cin overload bitwise operators << , >>. however, of time functions , tools use arguments or parameters pass information.

is there reason in grand history of c++ has lead being case?

i know rudimentary thing, new c++ , searching , google, asking few folks, has not turned answer.

(a) operator precedence

and

(b) looks nice - form of operators suggests function


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