Open files in a "sorted" order to work on them

[Bubiche]

Hello,
My problem is, I have data files named data001 -> data999, I need to somehow input a number n from the console and open files from data001 to datan using an std::ifstream fin to work on them one by one. What I'm thinking of right now is having a string s = "data" and running a loop from 1 to n. For example when the loop is at 1 I'll have s += "001"; and fin.open(s); but that takes too many if conditions and making the code looks a bit ugly. Is there a better approach for me?

Thank you for your help and sorry if I'm not clear enough (I'm not an English speaker), if you want to ask something that would help you help me, please do.

[MiiNiPaa]

Take a look:

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#include <iostream> #include <iomanip> #include <sstream> int main() { for(int i = 1; i < 1000; ++i) { std::ostringstream name; name << "data" << std::setfill('0') << std::setw(3) << i; std::cout << name.str() << '\n'; } }

data001 data002 data003 data004 data005 data006 data007 data008 data009 data010 data011 <SKIPPED> data996 data997 data998 data999

[Bubiche]

Thank you very much! That works wonderfully, I haven't used stringstream before but I guess it's time to learn something new.