cin >> char[]

This is a discussion on cin >> char[] within the C++ Programming forums, part of the General Programming Boards category; I dont think this is possible but can I use cin to get whats inside a char[]? could also use ...

  1. #1
    Burning in Hell! Luigi's Avatar
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    cin >> char[]

    I dont think this is possible but can I use cin to get whats inside a char[]? could also use string..

    this is gonna be used in a parser so I need to take one char at a time..

    ex.
    char* temp_string = "2*bob";
    char ch;
    cin.get(ch) >> temp_string;

    the parser should see this as 2 times bob..
    I know this exemple doesnt work... its just a guess what it might look like..
    thx
    Luigi


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  2. #2
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    "I dont think this is possible but can I use cin to get whats inside a char[]"

    cin operates on an input "stream", which is an abstract representation of an input device that's a source for data in your program--not on variables.

    You can access the characters in a char[] or a char* using array notation,

    char text[30]="2*bob";
    char letter;
    letter = text[0];

    or

    char* pstring="2*bob";
    char letter;
    letter = pstring[0];
    Last edited by 7stud; 04-04-2003 at 12:29 AM.

  3. #3
    S Sang-drax's Avatar
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    Re: cin >> char[]

    Originally posted by Luigi
    I dont think this is possible but can I use cin to get whats inside a char[]? could also use string..
    Good idea! This is possible and very useful.

    The solution is stringstream:

    Code:
    #include <sstream>
    using namespace std;
    
    string s = "2 3 4";
    stringstream strin(s);
    
    int a;
    //Use strin like cin
    strin >> a;
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

  4. #4
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    std::istringstream is likely what you want, though if you want to parse "2*a" the streams provide no convenent way to pull off just the "2", then "*", etc... Due to the lack of whitespace. The boost spirit parser is probably the best, most elegant way to solve these sorts of problems, though it takes forever to compile. std::string and the find_first_of family of functions is probably the easiest way to go about these things.

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