textfile 2

This is a discussion on textfile 2 within the C++ Programming forums, part of the General Programming Boards category; Part 1 I need to write a program called Encrypt.cpp, which opens a text file. The name of this file ...

  1. #1
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    Question textfile 2

    Part 1

    I need to write a program called Encrypt.cpp, which opens a text file. The name of this file is provided by the user. The program reads every character from this input file, adds 2 to the ASCII value of it, and prints the resulting character into a new file called output.dat.

    Part 2

    I then need to write a program called Decrypt.cpp, which opens a file containing encrypted data created using the scheme used in question 2. The decrypt program deciphers the text and displays it on the screen.

    Thanks

  2. #2
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    That's great! I need to write a game server for my MUD.
    If I did your homework for you, then you might pass your class without learning how to write a program like this. Then you might graduate and get your degree without learning how to write a program like this. You might become a professional programmer without knowing how to write a program like this. Someday you might work on a project with me without knowing how to write a program like this. Then I would have to do you serious bodily harm. - Jack Klein

  3. #3
    Guest Sebastiani's Avatar
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    Re: textfile 2

    Originally posted by davidnj732
    Part 1

    I need to write a program called Encrypt.cpp, which opens a text file. The name of this file is provided by the user. The program reads every character from this input file, adds 2 to the ASCII value of it, and prints the resulting character into a new file called output.dat.

    Part 2

    I then need to write a program called Decrypt.cpp, which opens a file containing encrypted data created using the scheme used in question 2. The decrypt program deciphers the text and displays it on the screen.

    Thanks


    That's nice, we all have *things to do*. Perhaps you could start by doing your own homework, posting specific questions, and above all, limiting posts on the same subject to a single thread.

    Thank you.
    Code:
    #include <ip.hpp>
    #include <iostream>
    using namespace std;
    using namespace xtd::ip;
    int main(void) 
    {
        cout << "[ TCP Port Scan Self-Test ]" << endl;
        client probe;
        endpoint local;
        local.address = "127.0.0.1";
        local.protocol = IPPROTO_TCP;
        for(local.port = 0; local.port < (1 << 16); ++local.port)
        {
            if(probe.open(local))
                cout << "Listening: ";
            else
                cout << "No Response: ";
            cout << local.port << endl;
        }    
    }

  4. #4
    Rez
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    Here's a little snippet.

    Code:
    char c;
    FILE *ifp, *ofp;
    
    /*...some code here...*/
    
    ifp = fopen("myfile.txt", "r");
    ofp = fopen("output.dat", "w");
    
    /*...some more code...*/
    
    c = getc(ifp);
    c += 2;
    fprintf(ofp, "%c", c);
    
    /*...some more code...*/
    
    fclose(ofp);
    fclose(ifp);
    
    /*The End*/

  5. #5
    RoD
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    How about instead of showing us a snippet and waiting for us to do it for you, you actually try and do it yourself or ask some questions.

  6. #6
    Rez
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    >>How about instead of showing us a snippet and waiting for us to do it for you, you actually try and do it yourself or ask some questions.<<

    You're confusing me bud Are your referring to me or to that newbie C++ programmer?

  7. #7
    napKINfolk.com napkin111's Avatar
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    Rez, I think RoD thought you were the same people. I don't think you should have given him all that code though, lol

    //napKIN
    "The best way to get answers is to just keep working the problem, recognizing when you are stalled, and directing the search pattern.....Don’t just wait for The Right Thing to strike you – try everything you think might even be in the right direction, so you can collect clues about the nature of the problem."
    -John Carmack

  8. #8
    Rez
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    I was trying to give the little guy an idea

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    thanks guys for you input. Just trying to learn something new. Professor gave us a challenge and I didn't have a clue how to begin or what I was doing. Still really a newbie. He gives us these challenges all the time.

  10. #10
    End Of Line Hammer's Avatar
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    Rez, your code is C, with this being a C++ forum, I expect davidnj732 is writing C++, so I'm afriad your examples won't help.

    davidnj732: Start with a tutorial or two. Post code when you get stuck.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  11. #11
    Rez
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    Well... I can't think of any other File I/O technique. Is there such a thing as an "entirely-different-from-C-that-is-unique-to-C++" File I/O routine?

  12. #12
    End Of Line Hammer's Avatar
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    Originally posted by Rez
    Well... I can't think of any other File I/O technique. Is there such a thing as an "entirely-different-from-C-that-is-unique-to-C++" File I/O routine?
    http://www.cppreference.com/cppio.html
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  13. #13
    Rez
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    Hey pretty neat!

  14. #14
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    Code:
    :startover
    open a file
    read 1 charater
    convert it to acsii number
    add 2 to it
    convert it to a character
    if youve reached EOF goto done
    else jump startover
    :done
    write to file
    thats to encrypt it, if ya need more pseudo code to decrypt it, jsut ask, noone will (they shouldnt anyways) be writing code for you.
    "...since anyone who is anyone knows C..." -Peter Cellik

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