What does new mean in c++?

In C, the new keyword is used to dynamically allocate memory. The specific steps include: specifying the memory type, using the new operator to allocate memory, and storing the allocated memory block address in a pointer variable. new is often used to allocate memory at runtime, such as creating objects, arrays, or variable-sized data structures, but be aware that it may throw errors and require manual release of memory, otherwise it may cause memory leaks.

The meaning of new in C

new is a keyword in C, used to dynamically allocate memory .

How to use new

To use new, follow these steps:

1. Specify the type of memory to allocate.
2. Use the new operator to allocate memory.

The following is the syntax of the new operator:

<code class="cpp">pointer_variable = new type;</code>

Where:

• pointer_variable is a pointer variable pointing to allocated memory.
• type is the type of memory to be allocated.

How new works

The new operator does the following:

1. Allocate a memory block of the specified size.
2. Store the address of the allocated memory block in a pointer variable.
3. Returns the address of the allocated memory block (as a pointer).

When to use new

#new is usually used to dynamically allocate memory, that is, when the memory requirements are determined while the program is running. It can be used to create objects, arrays, or any other type of data structure.

Advantages of new

• Provides flexibility in runtime memory allocation.
• Allows the creation of variable-sized data structures.
• Supports the construction and destruction of objects.

Disadvantages of new

• May throw an error if allocation fails.
• Need to manually release the allocated memory. If the memory is not released, a memory leak will result.

The above is the detailed content of What does new mean in c++?. For more information, please follow other related articles on the PHP Chinese website!