The meaning of new in c++

new is an operator in C that allocates memory and returns a pointer to the address of the newly allocated memory. Usage: type *ptr = new type; Purpose: Create new objects, allocate arrays/dynamic memory structures, expand/reduce memory size. Note: You must use delete to release memory after allocating it, otherwise it will cause memory leaks; the new operator may throw a std::bad_alloc exception (when there is no available memory).

What is new

#new in C?

new is an operator in C that allocates memory and returns a pointer to the address of the newly allocated memory.

how to use?

<code class="cpp">type *ptr = new type;</code>

Where:

• #type is the data type you want to allocate memory for.
• ptr is a pointer to newly allocated memory.

Example:

<code class="cpp">// 分配一个整型的内存
int *p = new int;

// 分配一个字符串的内存
char *s = new char[20];</code>

When to use it?

The new operator is used in the following situations:

• Create a new object.
• Allocate an array or other dynamic memory structure.
• Expand or reduce the existing memory size.

Note:

• After allocating memory using new, you are responsible for managing that memory and using the delete operation Release it when it is no longer needed.
• Not releasing allocated memory can cause memory leaks. The
• new operator can throw a std::bad_alloc exception, which occurs when no memory is available.

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