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Web下列程序的输出结果是【 】。#include＜iostream＞using namespace std；class base{public：int n；base (int x){n＝x；}virtual void set (int m){n＝m ...Webcout Prototype. The prototype of cout as defined in the iostream header file is:. extern ostream cout; The cout object in C++ is an object of class ostream.It is associated with …how many ww are there

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