Another Quick Question

This is a discussion on Another Quick Question within the C++ Programming forums, part of the General Programming Boards category; if I create a string like string filepath; how can I change it's variable, blah, blah, blah. An example would ...

  1. #1
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    Another Quick Question

    if I create a string like

    string filepath;

    how can I change it's variable, blah, blah, blah. An example would be better. For example, for cout it would be

    cout<<"users/"<<Name<<".txt";

    how do I get the same thing into the variable of filepath??

  2. #2
    Handy Andy andyhunter's Avatar
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    what? Say that again, maybe with complete sentences this time.
    i don't think most standard compilers support programmers with more than 4 red boxes - Misplaced

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  3. #3
    Carnivore ('-'v) Hunter2's Avatar
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    Look into std::stringstream and its variants (std::ostringstream if you're only using the various writing functions, std::istringstream if you're only using the reading functions).
    Code:
    #include <sstream>
    
    ...
    
    std::ostringstream sstr;
    sstr << "users/"<<Name<<".txt";
    
    std::string filepath = sstr.str();
    Just Google It. √

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  4. #4
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    Hi,

    You can do something like this as well:
    Code:
    string filename = "";
    string Name = "myfile";
    filename = "users/" + Name + ".txt";
    
    cout<< filename<<endl;
    That's called 'concatenating' strings, but you can also just call it "adding" strings together, and most people will understand what you mean.

    how can I change it's variable
    how do I get the same thing into the variable of filepath??
    A variable stores values. In this line:

    string Name = "myfile";

    Name is a variable, and it's value is "myfile". So, you would say, "how do I assign the variable Name a value". Or, "how can I change the variable's value?". Assignment is what you do when you use the equals sign(=).
    Last edited by 7stud; 02-16-2005 at 09:44 PM.

  5. #5
    Carnivore ('-'v) Hunter2's Avatar
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    Good point. If you're patching only strings together, then stringstream is a bit overkill. If you ever intend to mix in ints and other common datatypes though, that you might use with cout, then you'd probably like to use a stringstream.
    Just Google It. √

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