Nothing wrong!!! And yet I get this error:

This is a discussion on Nothing wrong!!! And yet I get this error: within the C++ Programming forums, part of the General Programming Boards category; Code: #include <cstdlib> #include <iostream> #include <conio.h> using namespace std; int main( void ) { ofstream out_file; out_file.open("test1.txt"); out_file << ...

  1. #1
    Registered User Queatrix's Avatar
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    Exclamation Nothing wrong!!! And yet I get this error:

    Code:
    #include <cstdlib>
    #include <iostream>
    #include <conio.h>
     
    using namespace std;
     
    int main( void )
    {
    ofstream out_file;
    out_file.open("test1.txt");
    out_file << "This_Is_A_Test_File" << endl;
    out_file.close();
     
    return 0;
    }
    There is nothing wrong with this code, and yet:

    Quote Originally Posted by DevC++
    aggregate `std::ofstream out_file' has incomplete type and cannot be defined
    Please help, this is just like the example script that tons of other sites give too!

    Thanks, August.

  2. #2
    VA National Guard The Brain's Avatar
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    Code:
    #include <fstream>
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
    • "Data Structures and Other Objects using C++" -Walter Savitch
    • "Assembly Language for Intel-Based Computers" -Kip Irvine
    • "Programming Windows, 5th edition" -Charles Petzold
    • "Visual C++ MFC Programming by Example" -John E. Swanke
    • "Network Programming Windows" -Jones/Ohlund
    • "Sams Teach Yourself Game Programming in 24 Hours" -Michael Morrison
    • "Mathmatics for 3D Game Programming & Computer Graphics" -Eric Lengyel

  3. #3
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    lol, nothing wrong

  4. #4
    Registered User Queatrix's Avatar
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    Thanks Brain, I would have used WriteFile() to do this job, but I am making a pure DOS program. Why don't the examples have you include <fstream>?

  5. #5
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    What examples?

    On some platforms you might get unlucky and the original code might work. However, whoever wrote the examples you speak of shouldn't have relied on that, since it is not guaranteed to work on all platforms. Basically, whenever you use a specific function, class or object from a library, you should explicitly include the header that declares it. You can almost always find out which header it is from your favorite library documentation.

  6. #6
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    Quote Originally Posted by Cool-August
    I am making a pure DOS program.
    No you are not. You are writing a console program. DOS is a generic term that means "Disk Operating System", which is used by MS-DOS, MS-Windows, Unix, Linux, VAX, VMS, Crey, MAC or another other operating system that interacts with a hard drive, floppy disk drives, CD rom drives, RAM drives, and tape drives.
    Last edited by Ancient Dragon; 01-10-2006 at 11:52 AM.

  7. #7
    Registered User Queatrix's Avatar
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    You are right, I am just making a program for a system that only has MS-DOS on it, and the console.

  8. #8
    Cat without Hat CornedBee's Avatar
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    <fstream> is for the file streams. <iostream> is for the generic stream classes and the console streams cout, cin and cerr.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  9. #9
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    Quote Originally Posted by Cool-August
    You are right, I am just making a program for a system that only has MS-DOS on it, and the console.
    what version os MS-DOS ? Version 6.X or earlier. Then you need a 16-bit compiler with probably will not support <fstream> because most of those compilers are too old.

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