**Exceptions in C++** are run-time anomalies or abnormal conditions that a program encounters during its execution.  C++ provides the following specialized keywords for exception handling:

**`try`**: represents a block of code that can throw an exception.

**`catch`**: represents a block of code that is executed when a particular exception is thrown.



# Definition 
**`std::bad_alloc`** is a type of exception that occurs when the new operator fails to allocate the requested space. This type of exception is thrown by the standard definitions of ​operator `new` (declaring a variable) and operator `new[]` (declaring an array) when they fail to allocate the requested storage space.

# Code
The following code displays the error message shown when `std::bad_alloc` is thrown.

#include <iostream> 
#include <new>
 // Driver code 
int main () { 
  try
  { 
     int * myarray = new int[1000000000000]; 
  } 
  catch (std::bad_alloc & exception) 
  { 
     std::cerr << "bad_alloc detected: " << exception.what(); 
  } 
  return 0; 
} 

What is the std::bad_alloc exception in C++?

An std::bad_alloc exception occurs when the new operator fails to allocate memory.