C++ Error Handling

title: Error Handling

C++ Exception Handling

An exception is a problem that arises during the execution of a program.Exceptions provide a way to transfer control from one part of a program to another. C++ exception handling is built upon three keywords: #try, #catch, and #throw.

  • throw − A program throws an exception when a problem shows up. This is done using a throw keyword.
  • catch − A program catches an exception with an exception handler at the place in a program where you want to handle the problem. The catch keyword indicates the catching of an exception.
  • #try − A try block identifies a block of code for which particular exceptions will be activated. It’s followed by one or more catch blocks.
#include <iostream> using namespace std; int main() { int x = -1; // Some code cout << "Before try \n"; try { cout << "Inside try \n"; if (x < 0) { throw x; cout << "After throw (Never executed) \n"; } } catch (int x ) { cout << "Exception Caught \n"; } cout << "After catch (Will be executed) \n"; return 0; }

Before you go on…

A review

  • Grouping of Error Types.
  • Separation of Error Handling code from Normal Code.
  • Functions/Methods can handle any exceptions they choose.

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