c++ - Fscanf 未从文件的最后一行读取预期值 (C/C++)

Question

下面的代码是我的任务调度程序的文件读取功能。一切正常，直到它尝试读取代表截止日期的数字序列(例如 1、2、3、4、5)。而不是整数，一些随机数被添加到表“截止日期”中。有谁知道这个问题的解决方案吗？

    #include <iostream>
    #include <vector>
    #include <cstdlib>
    #include <fstream>
    #include <map>
    #include <time.h>
    using namespace std;
    class Task{
        public:
            string Name;
            int Number;
            int Operation_Time_Machine_One;
            int Operation_Time_Machine_Two;
            int Task_Deadline;
    };
    int Maximum_Time_Between_IDE;
    int IDE_Duration;
    int Read_File(){
        string FileName= "";
        cout << "Please enter file name (with .txt):\t";
        cin >> FileName;
        std::vector<Task> Task_Vector;
        FILE* OpenedFile = fopen(FileName.c_str(),"r");
        int Number_Of_Tasks=0;
        int Duration_Of_Operation_One =0;
        int Duration_Of_Operation_Two =0;
        if( OpenedFile == NULL){
            exit(EXIT_FAILURE);
        }
        else{
                fscanf(OpenedFile,"%d", &Number_Of_Tasks);
                for (int i=0; i<= Number_Of_Tasks;i++){
                    Duration_Of_Operation_One=0;
                    Duration_Of_Operation_Two=0;
                    fscanf(OpenedFile, "%d, %d", &Duration_Of_Operation_One, &Duration_Of_Operation_Two);
                    Task New_task;
                    New_task.Name ="task" ;
                    New_task.Number = (i+1);
                    New_task.Operation_Time_Machine_One = Duration_Of_Operation_One;
                    New_task.Operation_Time_Machine_Two = Duration_Of_Operation_Two;
                    New_task.Task_Deadline =0;
                    Task_Vector.push_back(New_task);
                }
                fscanf(OpenedFile,"%d", &Maximum_Time_Between_IDE);
                fscanf(OpenedFile,"%d", &IDE_Duration);
                int Deadlines[Number_Of_Tasks];
//from now it's gettig weird
               for(int i=0; i<=Number_Of_Tasks;i++){
                    fscanf(OpenedFile,"%d, ", &Deadlines[i]);
                }
                for(int i=0; i<=Number_Of_Tasks;i++){
                    cout<<Deadlines[i]<<endl;
                }
        }
        fclose(OpenedFile);

        return 0;
    }
    int main()
    {
        clock_t time;
        time = clock();
        std::cout << "Hello world!" << std::endl;
        Read_File();
        time = clock() - time;
        printf ("Time of algorithm %f seconds.\n",((float)time)/CLOCKS_PER_SEC);
        return 0;
    }

示例输入:

5
74, 64
27, 74
69, 47
35, 54
101, 86
102
6
113, 242, 344, 144, 513

Answer 1

有些错误..

int Deadlines[Number_Of_Tasks]

VLA 在 C++ 中是不允许的。因此，您应该删除 C++标记，或使用 std::vector任何你想要 VLA 的地方。即std::vector<int> Deadlines(Number_Of_Tasks);

for(int i=0; i <= Number_Of_Tasks; i++)

 .... Deadlines[i]

您超出了数组的边界，这会导致未定义的行为。你想要做的是(在最后两个循环中):

for(int i=0; i < Number_Of_Tasks; i++)
              ^^^
              

最后，不要将 C 和 C++ 这两种不同的编程语言混为一谈。为您的计划选择其中一项并坚持下去。