How can I use cout

by

Typically by overloading operator<< for your class:

struct myclass { 
    int i;
};

std::ostream &operator<<(std::ostream &os, myclass const &m) { 
    return os << m.i;
}

int main() { 
    myclass x(10);

    std::cout << x;
    return 0;
}

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