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If the exception is thrown by the C++ code but is not caught, it causes SIGABRT. Some systems just print "Abort", some other systems also print the contents of e.what().
The question is: Does the C++ standard say that try/catch block is required in the main function for the program to be considered a well behaved program, or does C++ just silently rely on the system to process this?
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Try-Catch mechanisms are common in many programming languages such as Python, C++, and JavaScript.
throws: The throws keyword is used for exception handling without try & catch block. It specifies the exceptions that a method can throw to the caller and does not handle itself.
It is not mandatory. The catch statement is the exception handler in the Try Catch statements. A try block can have multiple catch blocks. But it must be declared the Exception class is a final one.
C does not have exception handling facilities. Errors are handled by examining the value returned by each function and signals (conditions reported to the program) are handled by using library functions.
As described in C++17 standard draft, in section 18.3.9 [except.handle]:
If no matching handler is found, the function
std::terminate()is called; whether or not the stack is unwound before this call tostd::terminate()is implementation-defined.
So, the behavior of such program is not considered undefined, since standard defines, that std::terminate will be called.
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