Question

我正在创建一个CPU调度程序，我已经使用在线编译器编译并测试了我的代码，一切工作都很好，但是当我将其传输到Microsoft Visual Studio以便制作一个exe时。文件响应时间（RT）的输出未显示任何值。

responseTime和counterTime以前是一个数组，在编译器中工作正常，但是MVS不允许表达式中使用非恒定值，因此我将其设为动态。但是输出仍然相同。

using namespace std;

void waiting_time(struct process a[], int n);

struct process { int process_id, burst_time, waiting_time, arrival_time, remain_time; }arr[100];

int process_finish[100];

int main() {

    arr[99].remain_time = 9999;

    //No of process in variable n
    int n;

    cout << "\nPlease enter the Number of Processor: ";

    cin >> n;

    cout << endl;

    system("CLS");

    //Take the Burst time for each process by using loop
    for (int i = 0; i < n; i++) {
        cout << endl;
        cout << "Enter the Arrival Time of Process " << i + 1 << " : ";

        cin >> arr[i].arrival_time;

        //increment the process_id by 1 after each burst_time
        arr[i].process_id = i + 1;

        cout << "Enter the Burst Time : ";

        cin >> arr[i].burst_time;

        //copy each process burst_time to another array remain_time[]
        arr[i].remain_time = arr[i].burst_time;
    }

    system("CLS");
    waiting_time(arr, n);

    system("PAUSE");
    return 0;

}

void waiting_time(struct process a[], int n) {
    int remain = 0, sum_wait = 0, sum_resp = 0, sum_turn = 0, sum_turnaround = 0, endTime, smallest;

    cout << "\n\nProcess Finish\t| Turnaround Time | Waiting Time | Response Time\n\n";

    // handle the INDEX of array process_finish.
    int process_f = 0;
    int* responseTime = new int[n];
    int* counterTime = new int[n];

    for (int i = 0; i < n; i++) {
        responseTime[i] = 0;
        counterTime[n] = 0;
    }

    for (int time = 0; remain != n; time++) {
        smallest = 99;

        for (int i = 0; i < n; i++) {
            if ((a[i].arrival_time <= time) && (a[i].remain_time < a[smallest].remain_time) && (a[i].remain_time > 0)) {
                smallest = i;
            }

        }

        if (counterTime[smallest] == 0) {
            responseTime[smallest] = time;
            counterTime[smallest] = 1;
        }
        a[smallest].remain_time--;

        if (a[smallest].remain_time == 0) {
            //to assign a process # which finish the total job
            process_finish[process_f] = smallest + 1;

            process_f++;

            //to assign a process_id
            a[smallest].process_id = smallest + 1;

            int tt, rt, wt;

            //One process complete the total job
            remain++;

            //Total completion time of process
            endTime = time + 1;

            //Calculate the TURNaround TIME (completionTime - TT )
            tt = endTime - a[smallest].arrival_time;

            //Calculate the Waiting Time
            wt = a[smallest].waiting_time = tt - a[smallest].burst_time;

            //Calculate the Response Time (completionTime - TT )   +++++++++++++
            rt = responseTime[smallest] - a[smallest].arrival_time;
            if (rt < 0)
                 rt += abs(rt);


            cout << "\n\tP[" << smallest + 1 << "]\t|\t" << tt << "\t|\t" << wt << "\t|\t" << rt;

            //For Average Waiting Time
            sum_wait += wt;

            //For Average Turnaround Time
            sum_turn += tt;

            //For Average Response Time
            sum_resp += rt;
        }

    }

    cout << "\n\nAverage waiting time =" << sum_wait * 1.0 / n;
    cout << "\n\nAverage turnaround time =" << sum_turn * 1.0 / n;
    cout << "\n\nAverage response time =" << sum_resp * 1.0 / n;

}

如果我们使用输入

number of process= 6
    Arrival   Burst
p1 -   0        7
p2 -   1        5
p3 -   2        3
p4 -   3        1
p5 -   4        2
p6 -   5        1

Response Time的输出应为-0,0,1,3,0,0和Average response time = 0.666667。

但是MVS输出响应时间-0,0,0,0,0,0和Average response time = 0。

Answer 1

发现我的错误：

    for (int i = 0; i < n; i++) {
      responseTime[i] = 0;
      counterTime[n] = 0;
    }

一个简单的答案：

    for (int i = 0; i < n; i++) {
      responseTime[i] = 0;
      counterTime[i] = 0;
    }

与在线编译器相比，Visual Studio中的C ++代码输出不同的值

1 个答案: