How to create a mutable array

How to create a dynamic array requires specific code examples

In programming, dynamic arrays are a very common and important data structure, which can be run as needed Dynamically allocate memory space. Compared with static arrays, the size of dynamic arrays can be adjusted during program running, allowing us to process data more flexibly.

In different programming languages, the methods of creating dynamic arrays may be different. Below I will use several common programming languages ​​as examples to introduce in detail how to create dynamic arrays and provide corresponding code examples.

1. C Language

In C language, we can use the standard library function realloc() to create dynamic arrays. First, we can use malloc() to allocate an initial memory space, and then use realloc() to adjust the size of the array.

#include <stdio.h>
#include <stdlib.h>

int main() {
    int* dynamicArray = (int*)malloc(5 * sizeof(int)); // 初始分配5个整数的空间

    // 对动态数组进行操作

    dynamicArray = (int*)realloc(dynamicArray, 10 * sizeof(int)); // 调整数组大小为10个整数

    // 对动态数组进行操作

    free(dynamicArray); // 释放动态数组的内存空间

    return 0;
}

2. C Language

In C language, we can use the keywords new and delete to create and release dynamic arrays. Similar to C language, we can use new to allocate initial memory space and delete to release memory space.

#include <iostream>

int main() {
    int* dynamicArray = new int[5]; // 初始分配5个整数的空间

    // 对动态数组进行操作

    delete[] dynamicArray; // 释放动态数组的内存空间

    return 0;
}

3. Python language

In the Python language, we can use lists to create dynamic arrays. Python's list is a dynamic array whose length can be changed. We can add elements through the append() method.

dynamicArray = [] # 创建一个空列表

# 对动态数组进行操作

dynamicArray.append(1) # 添加元素1到动态数组
dynamicArray.append(2) # 添加元素2到动态数组

# 对动态数组进行操作

dynamicArray.remove(1) # 移除元素1

print(dynamicArray) # 输出动态数组

# 输出结果：[2]

Summary:

Through the above code examples, we can see that the methods of creating dynamic arrays in different programming languages ​​are slightly different, but the core idea is the same. The creation of dynamic arrays allows us to process data more flexibly, dynamically adjust the size of the array when needed, and improve the efficiency and scalability of the program. At the same time, we also need to pay attention to promptly releasing the memory space occupied by the dynamic array when it is no longer used to avoid memory leaks.

The above is the detailed content of How to create a mutable array. For more information, please follow other related articles on the PHP Chinese website!