Saving into a variable file name

I need to write to a file name depending on a couple of variables and I'm having a hard time doing it. I got several different errors but couldn't find an answer anywhere in my books or the web on how it could be solved.

I'm using the following code and it works fine, but when I try to use the variables to use in the creation for the file and than it all goes wrong:

Working one
ofstream fout("C:/Users/rodrigo/Desktop/myfile.txt");
fout<<somevar<<yetanothervar;
fout.close();

NOT WORKING ONE:
int somevar;
int yetanothervar;
somevar = 1;
yetanothervar = 3;
string address;
address = "C:/Users/rodrigo/Desktop/"+somevar+yetanothervar+".txt";
ofstream fout(address);
fout<<somevar<<yetanothervar;
fout.close();

Any help would be much apreciated.
Cheers
Rodric MacOliverResearcherAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Chris HInfrastructure ManagerCommented:
Add quotations on your address output?
0
jkrCommented:
You can't add a string and an integer to form a new string like you can in e.g. C# - in C++ you need a stringstream, e.g.

#include <sstream> // <-- add this one

int somevar;
int yetanothervar;
somevar = 1;
yetanothervar = 3;

stringstream ss;

ss << "C:/Users/rodrigo/Desktop/" << somevar << yetanothervar <<".txt"; // create file name

string address;
address = ss.str();

ofstream fout(address);
fout<<somevar<<yetanothervar;
fout.close();

Open in new window

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
sarabandeCommented:
ofstream fout(address);

Open in new window

that will not compile. use address.c_str() as argument instead.

the usage of string streams could be improved by defining the following macro (you may put it into a common header file).

#define VARFILENAME(s) ((std::ostringstream&)((std::ostringstream())<<s)).str().c_str()

Open in new window

then you can do

std::ofstream fout(VARFILENAME("C:/Users/rodrigo/Desktop/" << somevar << yetanothervar <<".txt"));

Open in new window

the macro could be used not only for filenames but for any other purpose where required type is const char *.

Sara
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C++

From novice to tech pro — start learning today.