How to define dynamic array

Define dynamic arrays in C: Use the syntax "type_name *array_name = new type_name[array_size];". 2. Use "delete[] array_name;" when releasing a dynamic array.

How to define a dynamic array in C

A dynamic array is a special data structure that allows its size to be adjusted at runtime. Unlike static arrays, the number of elements of a dynamic array can grow or shrink during program execution.

Define a dynamic array

To define a dynamic array in C, you can use the following syntax:

type_name *array_name = new type_name[array_size];

Where:

• type_name is the data type of the array element.
• array_name is the name of the array.
• array_size is the size of the array, expressed in the number of elements.

Release dynamic array

When a dynamic array is no longer needed, it must be released using the delete[] operator:

delete[] array_name;

Example

The following example shows how to create and access dynamic arrays:

int *numbers = new int[5];  // 创建一个包含 5 个 int 元素的动态数组

numbers[0] = 10;  // 访问数组的第一个元素

// 输出数组元素
for (int i = 0; i < 5; i++) {
  cout << numbers[i] << " ";
}

Note:

• The elements of dynamic arrays are allocated in heap memory, while the elements of static arrays are allocated in stack memory.
• The size of dynamic arrays can be adjusted during program execution using the new[] and delete[] operators.
• Accessing an array out of bounds will lead to undefined behavior, so you always need to pay attention to the size of the array.

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