Programming Forums - C++ question

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- - C++ question (http://www.programmingforums.org/showthread.php?t=11666)

physicist

Oct 22nd, 2006 7:17 PM

C++ question

i got v0.1a working theres a link in my other thread here.

workin on v0.1b and this line doesnt work

ofstream myfile2("//"d"//answers.txt");

only this line; the error has nothing to do with other lines
d is a string which was input by user (their name)
this is the error

23 C:\Dev-Cpp\TestApp0.1b\test3-1.cpp expected `)' before "d"

so basically i cant have a string in my filepath of this newly created text file?

Prm753

Oct 22nd, 2006 7:36 PM

It looks like you are trying to create a folder with a username with the answers inside it. Make your string combined with "answers.txt" before you create the file. // is a comment, \\ is for file paths.

physicist

Oct 22nd, 2006 8:05 PM

exactly! thanks
now, it still doesnt work when i change // to \\
and if the string combines then it is not in a new folder just a file with a diff. name
AND i get an error if i try to specify the path as just a string...
so how can i make it so that when the user enters their name a subdir named as the string they just entered in with a .txt is made.....

physicist

Oct 22nd, 2006 9:03 PM

i tried combining the strings prm753 but it still wont compile or link

Sane	Oct 22nd, 2006 9:16 PM

I'm a little lost with what you're trying to do, but have you tried the following yet?

ofstream myfile2("..\\answers.txt");

By the way, your signature is wrong.

sqrt(x^2) does not equal x. It equals |x|.

Therefore, sqrt((-1)^2) equals |-1|, or 1.

Dietrich

Oct 22nd, 2006 9:27 PM

sqrt(x^2) does not equal x. It equals |x|.
Therefore, sqrt((-1)^2) equals |-1|, or 1.

I would say Sane saved the world from being overrun by thousands of mad math teachers!

physicist

Oct 22nd, 2006 10:14 PM

i know its wrong...its a joke (sorry if it was too simple)
anyway sane, thats not what im tryin to do. i am trying to specify the file path using a string of what the user entered as his name plus answer.txt. and it doesnt work. evidently i cannot specify a file name in the fstream parameter as a variable representing a string....

The Dark

Oct 22nd, 2006 10:25 PM

Quote:

Originally Posted by physicist (Post 117272)

Try using + to add strings together, if d is an std::string object. If it isn't you will have to add the strings together using strcat.

Also try to make your topic titles a bit more informative, we can guess that it is a "C++ question" as it is in the C++ forum. Maybe something like "how to add strings together" or "how do I get the user to input a directory". Similarly, your other topic "new question now" is just as uninformative.

Seif	Oct 23rd, 2006 7:39 AM

Another problem is that you are trying to pass the open() function a string, when in actual fact it takes a character array const char *. So either use a character array to store your file path, or use the c_str() member function of your current string to convert it to a char array.

for example:

string filepath = "C:\\";

string filename = "answers.txt";

string file = filepath + filename;



ofstream myfile2(file.c_str());

physicist

Oct 23rd, 2006 7:49 PM

ok this compiles fine but when i enter the name it jsut freezes...

#include <cstdlib>

#include <iostream>

#include <fstream>

#include <string>



using namespace std;



int main()

{

    int s;

    string a,b,c,d,e,f;

    f="answers.txt";

    cout <<"Enter name";

    getline (cin,d);

    ifstream myfile("example.txt");

    d+f=e;

    ofstream myfile2(e.c_str());

    ofstream myfile3("namelist.txt");

    myfile3 <<d;

    while (! myfile.eof() )

    {

      getline (myfile,a);

      cout << a << endl;

    }

    cout <<"Answer ALL Questions. Follow Directions and mark each answer \nwith the question number in front of it:\n";

    cout <<"Example Answers: 1)50mA 2)Dublin 3)iostream.h\n";

    cout <<"NOTE: DO NOT PRESS ENTER UNTIL YOU HAVE ANSWERED ALL QUESTIONS. \nAnswer just like the example above.\n";

    getline (cin,b);

    myfile2 <<b;

    cout <<"All Answers to all questions submitted. \nDONT WORRY IF YOU MADE A MISTAKE, SIMPLY RESTART THE PROGRAM \nAND YOUR ANSWERS WILL BE MODIFIED!\n";

    myfile2.close();

    myfile.close();

    system("PAUSE");

    return 0;

}

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