Thread: Help in outputing different file names in a loop

  1. #1
    Registered User
    Join Date
    Feb 2009
    Posts
    3

    Help in outputing different file names in a loop

    I got this program here which is suppose to output a .ppm file. How can i modify the Filename to get an output of out1.pmm, out2.pmm, out3.pmm .. so on and so forth for a while loop?

    Code:
    unsigned char Filename = "out1.ppm";
    
    while (i < 100)
    {
    
    FILE *stream;
    
    stream = fopen(Filename, "wb" );                     // Open the file for write
    
    //rest of the program;
    //..
    //..
    
    }

  2. #2
    Registered User
    Join Date
    Feb 2003
    Posts
    596
    Code:
    #include <sstream>
    // ...
    
    std::stringstream ss;
    
    while (i < 100)
    {
      ss << "out" << i << ".ppm";
      FILE *stream;
    
      stream = fopen(ss.str().c_str(), "wb" );   // Open the file for write
      ss.str("");                                // clear the stringstream
    //rest of the program;
    //..
    //..
    
    }

  3. #3
    Hurry Slowly vart's Avatar
    Join Date
    Oct 2006
    Location
    Rishon LeZion, Israel
    Posts
    6,794
    if this is C++ you probably need to use fstream instead of FILE*

    If this is C - you should ask on the proper forum
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  4. #4
    Kung Fu Kitty Angus's Avatar
    Join Date
    Oct 2008
    Location
    Montreal, Canada
    Posts
    115
    There's no such need. Iostream laid the last straw on my camel a long time ago. I use stdio.h all the time.

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