reading from file and writing in a nother file

I want to make aprogram to read a file including the marks of student where each line includes the student name ,his bench number and mark .. i want to use this program to write that in a nother file which will include the same things included in the input file and also to calculate the average of the marks of the student and write it in the output file

i wrote the following and it doesnt work can you tell me what are the problems with my code

Code:

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#include<iostream>
#include<cstdlib>
#include<fstream>
using namespace std;

struct student
{
char name[];  // for the name of the student
int BN;            // for the bench number
int mark; //for the mark of the student


int main()
{
        student m;
        double sum ,av; // sum is the sum of the marks of students and av is their average
        int i=0;  //counting the nuber of students
        sum =0;
    ifstream fin;
    ofstream fout;
    fin.open("E://marks.txt");
    if (fin.fail())
        {
      cout<<"Can not open file\n";
        exit(1);
        }
  fout.open("E://results.txt")
  fin>>m.name;
  while(!fin.eof())
  {
          fout<<m.name;
          fout<<"  ";    //space
          fin>>m.BN;
          fout<<m.BN;
          fout<<"  ";
          fin>>m.mark;
          sum+=m.mark;
          fout<<m.mark;
          fout<<endl;
          i++;
          fin>>m.name;
  }
  av=sum/i;
  fout<<" the average of the students is :"<<av <<endl;
  fin.close();
  fout.close();
  return 0;
}

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so any one can tell me what are the errors and also if there is another method to do that
thanks in advance

sorry i missed something for the structure

Code:

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struct student
{
char name[];  // for the name of the student
int BN;            // for the bench number
double mark; //for the mark of the student
};

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i hope anyone tell me where is the error in my program

thanks in advance

Code:

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fout.open("E://results.txt"); <--- // ye 4got this on my 5 secs of observation.

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What exactly is the problem?? It helps if you say so that we can know what to look for.

its treating your forward slashes in the E:// as comments for every thing after the // in that line

you should be using \\ change all the things that arn't comments from // to \\ then try it again.

Thanks all i eventually detected the error

in the struct i didnt define the size of the array of name
i should put for example

Code:

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char name[20]

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