Chapter 9: Problem 19

The __________ operator is used to dynamically allocate memory.

Short Answer

Expert verified

Answer: The operator used for dynamic memory allocation is the "new" operator. It requests a block of memory of the specified size on the heap during runtime. If successful, it returns a pointer to the allocated memory. Otherwise, it throws a "bad_alloc" exception if it fails to allocate the requested memory.

Step by step solution

Identify the Operator

The operator used to dynamically allocate memory is called the "new" operator. It is primarily used in C++ for allocating memory on the heap during the runtime of a program.

How 'new' Operator Works

The 'new' operator requests a block of memory of the specified size on the heap. If the request is successful, it returns a pointer to the allocated memory. Otherwise, it throws a "bad_alloc" exception if it fails to allocate the requested memory.

Syntax

To use the 'new' operator, the general syntax is as follows: ``` pointer_variable = new data_type; ``` For example, to allocate an integer on the heap, you would use the following syntax: ```cpp int *ptr_num = new int; ```

Initializing Memory

You can also initialize the allocated memory when using the 'new' operator. Here's an example of how to allocate and initialize an integer: ```cpp int *ptr_num = new int(5); // allocates an integer on the heap and initializes it with the value 5 ```

Deallocating Memory

When using the 'new' operator to allocate memory, it's essential to deallocate the memory once it's no longer needed using the 'delete' operator. This helps to prevent memory leaks in your program. To deallocate memory allocated by the "new" operator, the typical syntax is: ```cpp delete pointer_variable; ``` For example, to deallocate the memory allocated for an integer: ```cpp delete ptr_num; ```

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The __________ operator is used to dynamically allocate memory.

Short Answer

Step by step solution

Identify the Operator

How 'new' Operator Works

Syntax

Initializing Memory

Deallocating Memory

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