C++ User-Defined Exceptions

by Online Tutorials Library July 14, 2022

C++ User-Defined Exceptions

The new exception can be defined by overriding and inheriting exception class functionality.

C++ user-defined exception example

Let’s see the simple example of user-defined exception in which std::exception class is used to define the exception.

 #include <iostream> #include <exception> using namespace std; class MyException : public exception{     public:         const char * what() const throw()         {             return “Attempted to divide by zero!n”;         } }; int main() {     try     {         int x, y;         cout << “Enter the two numbers : n”;         cin >> x >> y;         if (y == 0)         {             MyException z;             throw z;         }         else         {             cout << “x / y = ” << x/y << endl;         }     }     catch(exception& e)     {         cout << e.what();     } } 

Output:

Enter the two numbers : 10 2 x / y = 5

Output:

Enter the two numbers : 10 0 Attempted to divide by zero!

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Note: In above example what() is a public method provided by the exception class. It is used to return the cause of an exception.

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