Problem with setting filename using a string...

[Adobe Dharuma]

I want to use the string - filename , as the file name, but I can't get it to work...
How can I do this???


I would also want to add Input to the file, where it says File Info, how would I do this...


#include <cstdio>
#include <iostream>
#include <stdlib.h>
#include <string>

using namespace std;

int main()
{
{
string filename;
cin >> filename;
cout << filename;
}
FILE * file = fopen("This is where I want my string name" , ".dat","w");
fprintf(file, "File Info");
fclose(file);
system ("PAUSE");
return 0;
}

Any info. would be helpful...

[Speedo]

Use string's c_str() method.

fopen(filename.c_str( ), "w");

[Adobe Dharuma]

I get the error message: 'filename' undeclared [first use of this function]...

[GCDEF]

I get the error message: 'filename' undeclared [first use of this function]...

int main()
{
    {
        string filename;
        cin >> filename;
        cout << filename;
    }
    FILE * file = fopen("This is where I want my string name" , ".dat","w");
    fprintf(file, "File Info");
    fclose(file);
    system ("PAUSE");
    return 0;
}

You're limiting its scope by using those braces. I don't see what purpose they serve here.

[dwhitney67]

I also don't see the purpose of using fopen() when C++ provides the fstream (or more specifically, ofstream) class.

#include <fstream>

int main()
{
  ...
  std::cout << "Enter filename: ";
  std::cin   >> filename;

  std::ofstream ofs(filename.c_str());

  ofs << "File Info";
  ...
}