I am trying to understand this program from my class. I understnad the basic for

Question

  I am trying to understand this program from my class.  I understnad the basic form of the throw catch excption, but I don't understand what the cerr function does.  It looks like it's for an output error msg of sorts?   Anyways, when I run this program, it doesn't output the error msg even though p.fly is called. can someone explain this?    Thanks in advance.     // #include<iostream> #include<string> using namespace std;  class BirdException {    public:   BirdException(const string s) : msg(s) {}  // Does this imply that it is inhearting the msg function for this class?     string msg; };  class Bird {   public:     virtual void fly(void) = 0; };  class Penguin : public Bird {   public:     virtual void fly(void)     {       throw BirdException("oops, penguins can't fly");     } };  int main() {   Penguin p;    try   {     p.fly();   }   catch ( BirdException& be )   {     cerr << "Exception caught: " << be.msg << endl;   } } 

Explanation / Answer

It displays the error message. I got output as below

Exception caught: oops, penguins can't fly

I am using vc++ 2013 .I checked on Unix environment, got same output

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