Question

我在声明ifstream对象的行上收到错误：

ifstream input;

或

ifstream input("somefile");

这将在第一次正常工作，但是下一次循环之前的行会发生运行时错误！

以下是完整的程序源代码：

#include<conio.h>
#include<iostream.h>
#include<fstream.h>
#include<stdlib.h>
#include<string.h>
#include<stdio.h>
#include<iomanip.h>
#include<ctype.h>
class SV
  {
     private:
     char Name[30];
     char Gender[7]; //Try setting the bound of this array to 3 and see what will happen to the value of GioiTinh whenever we assign a string to it
     char BirthDay[10];
     char HomeTown[40];
     char CurrentLocation[40];
     char SchoolYear[5];
     char Course[20];
     char Qualification[10];
     float AverageMark;
     SV * next;

     public:
      int Nhap()
      {
            char * info[9];
            int i;
            SV * newSV = new SV;
            SV * q = new SV;
            strcpy(Name, "");
//-----------------------
            for(i = 0; i < 9; i++)
              info[i] = new char[50];
            i = 0;
            ifstream input("Student.INP"); // <--- I'm stuck here
            if(input.bad())
              {
                 cout<<endl<<"The file \"Student.INP\" doesn't exist in the folder of the program!!!";
                 return -1;
              }
            do
            {
              char s[255];
              i = 0;
              input.getline(s,255);
              int j = 0;
              int k = 0;
              do
              {
                 if(s[j] == '\0')
                    {
                      info[i][k] = '\0';
                      break;
                    }
                 if(s[j] == '|')
                    {
                      info[i][k] = '\0';
                      k = 0;
                      i++;
                      j++;
                      continue;
                    }
                 info[i][k] =  s[j];
                 k++;
                 j++;
              }while(j < 255);
            strcpy(newSV->Name,info[0]);
            strcpy(newSV->Gender,info[1]);
            strcpy(newSV->BirthDay,info[2]);
            strcpy(newSV->HomeTown , info[3]);
            strcpy(newSV->CurrentLocation,info[4]);
            strcpy(newSV->SchoolYear,info[5]);
            strcpy(newSV->Course,info[6]);
            strcpy(newSV->Qualification,info[7]);
            newSV->AverageMark = atof(info[8]);
            newSV->next = NULL;
            if(strcmp(Name, "") == 0)
            {
                 *this = *newSV;
                 next = q;
            }
            else
            {
                *q = *newSV;
                if(!input.eof())
                  {
                    q->next = new SV;
                    q = q->next;
                  }
                else
                 {
                    q->next = NULL;
                    delete q;
                    break;
                 }
            }

            }while(1);
            input.close();
            delete info;
            delete newSV;
            return 0;
      }
//There are more functions ...
  };
//The main entry point of the program
void main()
{
  do
    {
     QLSV();
     cout<<endl<<"Press any key to continue ...";
     getch(); 
    }while(1);

}

以下链接可能有所帮助：

Borland Turbo C++ 4.5
Full source code

如果我使用FILE指针代替（C）ifstream（C ++），我可以“更长时间”运行程序，但有时错误也指向FILE * f = fopen("somefile", "r");。

为什么我的ifstream对象声明中出现错误？

0 个答案: