编写程序c++模拟实现扫描算法磁盘调度算法

好的，下面是一个简单的C++程序，模拟实现扫描算法磁盘调度算法：

#include<iostream>
#include<cstdlib>
#include<ctime>
#include<algorithm>
using namespace std;

const int MAX_NUM = 200;
const int CYLINDER_NUM = 1000;
const int SCAN_DIRECTION = 1;

int request[MAX_NUM];

// 随机生成请求序列
void generate_request_sequence(int n) {
    srand(time(NULL));
    for (int i = 0; i < n; i++) {
        request[i] = rand() % CYLINDER_NUM;
    }
    sort(request, request + n);
}

// 扫描算法磁盘调度算法
int scan_algorithm(int start_cylinder, int n) {
    int total_movement = 0;
    int current_cylinder = start_cylinder;
    int direction = SCAN_DIRECTION;
    int i = 0;
    while (i < n && request[i] < current_cylinder) {
        i++;
    }
    while (i < n) {
        total_movement += abs(current_cylinder - request[i]);
        current_cylinder = request[i];
        i++;
        if (i == n && direction == SCAN_DIRECTION) {
            direction = -1;
            i--;
        }
        else if (i == n && direction == -1) {
            direction = SCAN_DIRECTION;
            i = 0;
        }
    }
    return total_movement;
}

int main() {
    int n, start_cylinder;
    cout << "请输入请求序列的长度：";
    cin >> n;
    cout << "请输入起始柱面号：";
    cin >> start_cylinder;
    generate_request_sequence(n);
    int total_movement = scan_algorithm(start_cylinder, n);
    cout << "扫描算法磁盘调度算法的总移动距离为：" << total_movement << endl;
    return 0;
}

程序中，首先通过`generate_request_sequence`函数随机生成请求序列，然后通过`scan_algorithm`函数实现扫描算法磁盘调度算法。最后在`main`函数中，输入请求序列的长度和起始柱面号，调用`scan_algorithm`函数计算总移动距离并输出。