Catching Class Types : Exception type « Exceptions « C++ Tutorial

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C++ Tutorial » Exceptions » Exception type 
6.4.5.Catching Class Types
#include <iostream>
#include <cstring>
using namespace std;
   
class MyException {
public:
  char str_what[80];
  int what;
   
  MyException() { *str_what = 0; what = 0}
   
  MyException(char *s, int e) {
    strcpy(str_what, s);
    what = e;
  }
};
   
int main(){
  int i;
   
  try {
    cout << "Enter a positive number: ";
    cin >> i;
    if(i<0)
      throw MyException("Not Positive", i);
  }
  catch (MyException e) { // catch an error
    cout << e.str_what << ": ";
    cout << e.what << "\n";
  }
   
  return 0;
}
6.4.Exception type
6.4.1.Different types of exceptions can be caught
6.4.2.how to restrict the types of exceptions that can be thrown from a function.
6.4.3.Catch double exception
6.4.4.Catching class type exceptions
6.4.5.Catching Class Types
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