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ios bad() function in C++ with Examples
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exception::what() in C++ with Examples

Last Updated : 28 May, 2020
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The exception::what() used to get string identifying exception. This function returns a null terminated character sequence that may be used to identify the exception. Below is the syntax for the same: Header File: 
  #include<exception>
Syntax: 
  virtual const char* what() const throw();
Return: The function std::what() return a null terminated character sequence that is used to identify the exception. Note: To make use of std::what(), one should set up the appropriate try and catch blocks. Below are the programs to understand the implementation of std::what() in a better way: Program 1: CPP14 
// C++ code for exception::what() #include <bits/stdc++.h>  using namespace std;  struct gfg : exception {     const char* what() const noexcept     {         return "GeeksforGeeks!! "                "A Computer Science"                " Portal For Geeks";     } };  // main method int main() {      // try block     try {         throw gfg();     }      // catch block to handle the errors     catch (exception& gfg1) {         cout << gfg1.what();     }      return 0; }
Output: 
  GeeksforGeeks!! A Computer Science Portal For Geeks
Program 2: CPP14 
// C++ code for exception::what()  #include <bits/stdc++.h>  using namespace std;  struct geeksforgeeks : exception {     const char* what() const noexcept     {         return "Hey!!";     } };  // main method int main() {      // try block     try {         throw geeksforgeeks();     }      // catch block to handle the errors     catch (exception& gfg) {         cout << gfg.what();     }      return 0; }
Output: 
  Hey!!
Reference: http://www.cplusplus.com/reference/exception/exception/what/

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ios bad() function in C++ with Examples
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Article Tags :
  • Misc
  • C++
  • CPP-Functions
Practice Tags :
  • CPP
  • Misc

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