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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_exception_what.htm below:

C++ Exception Handling Overview

It is used to get string identifying exception.

Following is the declaration for std::what.

virtual const char* what() const throw();

virtual const char* what() const noexcept;

none

It returns a null terminated character sequence that may be used to identify the exception.

No-throw guarantee − no members throw exceptions.

In below example for std::what.

#include <iostream>       
#include <exception>      

struct ooops : std::exception {
   const char* what() const noexcept {return "Ooops! It is a identity error\n";}
};

int main () {
   try {
      throw ooops();
   } catch (std::exception& ex) {
      std::cout << ex.what();
   }
   return 0;
}

The sample output should be like this −

Ooops! It is a identity error

exception.htm

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