Assigning a name to a variable

This is a discussion on Assigning a name to a variable within the C++ Programming forums, part of the General Programming Boards category; I'm trying to have the user enter a word or two (specifically a name), and then be able to recall ...

  1. #1
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    Assigning a name to a variable

    I'm trying to have the user enter a word or two (specifically a name), and then be able to recall that name later in the program as a variable (or some other type of memory storage that I've yet to hear of). How do I store it?

    Thanks

  2. #2
    and the Hat of Guessing tabstop's Avatar
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    In a std::string? You should use fgets, I guess. (Elysia does the fgets proselytizing, so you should find one of her posts.)

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    C++ Witch laserlight's Avatar
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    This is the C++ programming forum though, so we tend to do C++ I/O stream proselytising instead.

    PAragonxd, what have you learnt about reading in user input?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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    Well, you may remember that I'm very new around here, and to C++ in general... so assume that I know minimum.

    EDIT: But please, mind your time. I really don't need a huge lengthy explanation, so I don't want you to spend your time writing one.
    Last edited by PAragonxd; 12-11-2007 at 10:41 PM.

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    If the variables which you want to name at run-time are of the same type, I would picture this as a job for an std::map<> container.

    Code:
    std::map<std::string, int> myVariables;
    
    void AddVariable(std::string name, int data)
    {
       myVariables[name] = data;
    }
    
    void GetVariableName()
    {
       std::string name;
       std::cin >> name;
       myVariables[name] = 0;
    }
    
    void SetVariableData(const std::string& name)
    {
       int data;
       std::cin >> data;
       myVariables[name] = data;
    }
    
    // ...
    Edit: This code is quite over simplistic yet it clearly shows the concept I wanted to show you.

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    I didn't imagine a simple process would require all that, maybe I didn't ask my question clear enough.

    I'm aiming to store a name in the same way you would store a numeral variable. Is it even possible?

    Thanks for the help though desolation, even if I didn't quite understand it.
    Quote Originally Posted by Desolation View Post
    Edit: This code is quite over simplistic yet it clearly shows the concept I wanted to show you.
    That does a nice job of making me feel like a moron :P.
    Last edited by PAragonxd; 12-11-2007 at 11:13 PM.

  7. #7
    Algorithm Dissector iMalc's Avatar
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    Quote Originally Posted by tabstop View Post
    In a std::string? You should use fgets, I guess. (Elysia does the fgets proselytizing, so you should find one of her posts.)
    Oh you mean Elysia is a 'her'?

    I'd go for the first-hand knowledge if I were you, and go straight to the FAQ. (hey that ryhmes! )
    http://faq.cprogramming.com/cgi-bin/...&id=1043284351
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    Quote Originally Posted by iMalc View Post
    I'd go for the first-hand knowledge if I were you, and go straight to the FAQ.
    That's a great quote :P.

    Yeah, kinda hasty of me to ask here without checking there first. Sorry about that one >_>.

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    Code:
    #include <iostream>
    
    int main()
    {
        std::string name1;
        std::string name2;
    
        std::cout << "Enter a name:\n";
        std::cin >> name1 >> name2;
    
        std::cout << "You printed: " << name1 << ' ' << name2 << '\n';
    
        return 0;
    }
    Last edited by robwhit; 12-12-2007 at 04:38 AM.

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    Awesome, thanks robwhit

  11. #11
    and the Hat of Guessing tabstop's Avatar
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    Quote Originally Posted by iMalc View Post
    Oh you mean Elysia is a 'her'?
    I don't actually know that and am guessing. If I'm wrong, all apologies.

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    Oh... Sorry I thought you wanted to actually name a variable and not have a variable contain a string.

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    Yeah I'm sorry about that, I didn't think before I asked :P.

    Thanks a lot for your attempt though.

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    Just saw your edit. I clearly didn't intend to make you feel like a moron and I'm sorry if I looked like so.

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    Lol, don't worry about it :P. I figured it wasn't on purpose.

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