编辑“︁C 语言函数指针”︁（章节）

= 高级应用 =
== 回调函数（Callback）==
函数指针最常见的用途是实现回调机制：

<syntaxhighlight lang="c">
#include <stdio.h>

// 回调函数类型定义
typedef void (*Callback)(int);

void processArray(int arr[], int size, Callback cb) {
    for (int i = 0; i < size; i++) {
        cb(arr[i]);  // 对每个元素调用回调
    }
}

void printElement(int x) {
    printf("%d ", x);
}

void squareElement(int x) {
    printf("%d ", x * x);
}

int main() {
    int nums[] = {1, 2, 3, 4, 5};
    
    printf("Original: ");
    processArray(nums, 5, printElement);
    
    printf("\nSquared: ");
    processArray(nums, 5, squareElement);
    
    return 0;
}
</syntaxhighlight>

'''输出'''：
<pre>
Original: 1 2 3 4 5 
Squared: 1 4 9 16 25
</pre>

== 函数指针数组 ==
可创建函数指针数组实现状态机或命令模式：

<syntaxhighlight lang="c">
#include <stdio.h>

typedef void (*Command)();

void start() { printf("Starting system...\n"); }
void stop() { printf("Stopping system...\n"); }
void reboot() { printf("Rebooting...\n"); }

int main() {
    Command commands[] = {start, stop, reboot};
    int choice;
    
    printf("Menu:\n1. Start\n2. Stop\n3. Reboot\n> ");
    scanf("%d", &choice);
    
    if (choice >= 1 && choice <= 3) {
        commands[choice - 1]();  // 数组索引从0开始
    }
    
    return 0;
}
</syntaxhighlight>