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In C++, which of the following methods contained in the exception handling mechanism in a program fails to find a matching catch block for a raised exception?
1. unexpected()
2. terminate()
3. null()
4. default()

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Correct Answer - Option 1 : unexpected()

std::unexpected() is called by the C++ runtime when a dynamic exception specification is violated: an exception is thrown from a function whose exception specification forbids exceptions of this type. std::unexpected() may also be called directly from the program.

The terminate() function calls the function pointed to by terminate_handler . By default, terminate_handler points to the function abort() , which exits from the program. You can replace the default value of terminate_handler with the function set_terminate() 

To  assign the pointer NULL to a pointer variable in case you do not have exact address to be assigned. This is done at the time of variable declaration. A pointer that is assigned NULL is called a null pointer.

Default Arguments in C++ A default argument is a value provided in a function declaration that is automatically assigned by the compiler if the caller of the function doesn't provide a value for the argument with a default value. 

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