CODEWITHSUNDEEP
c++operatorstry-catch
user6864832
user6864832

Reputation:

What is the usage of catch in this C++ code

Hi I am very new to C++ programming, and I am really hard to understand the code below in which they have used catch. So I want to know why do they use catch in this code. Thanks in advance

 #include <iostream>
 #include <exception>
 using namespace std;
 int main () 
 {
 try
 {
  int* myarray = new int[1000];
  cout << "allocated";
 }
 catch (exception& e)
 {
    cout << "Standard exception: " << e.what() << endl;
   }
    return 0;
  }

Upvotes: 1

Views: 106

Answers (3)

Mausam Sinha
Mausam Sinha

Reputation: 153

try and catch come inside exception handling in C++

  try
{

 int* myarray = new int[1000];

    cout << "allocated";
}

catch (exception& e)
{

cout << "Standard exception: " << e.what() << endl;

}

in this case first it wil check the memory allocation using try block and if it fail to allocate the memory then using catch it will throw exception,that memory could not be allocated

Upvotes: 0

samAlvin
samAlvin

Reputation: 1678

The statements in catch will be executed when one of the statements in the try block throws an exception. This tutorial link will helps a ton: http://www.cplusplus.com/doc/tutorial/exceptions/

Upvotes: 0

Alex Lop.
Alex Lop.

Reputation: 6875

The operator new may throw an exception in case it cannot allocate the required space.

From the link above:

throwing (1)    void* operator new (std::size_t size) throw (std::bad_alloc);

Throws bad_alloc if it fails to allocate storage. Otherwise, it throws no exceptions (no-throw guarantee).

Upvotes: 5

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