string find

This is a discussion on string find within the C++ Programming forums, part of the General Programming Boards category; heyas, if anyone could enlighten me as to why this is not acting as intended i'd be greatly apprecitive it ...

  1. #1
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    string find

    heyas,

    if anyone could enlighten me as to why this is not acting as intended i'd be greatly apprecitive

    it is *meant* to store the following

    vector index 0: assume
    vector index 1: nothing
    vector index 2: expect
    vector index 3: anything

    what it is _actually_ storing is the following:

    vector index 0: assume
    vector index 1: nothing expect
    vector index 2: expect anything
    vector index 3: anything

    also, i recieve different still results from using cin>>paramCommand;

    any ideas why using cin would give different results to my static string in the example below?

    i'm very keen to get on the top of both of these issues, thanks in advance.

    Code:
    int index = 0;
    int loc = 0;
    
    /*keep iterating through string until the end
    using spaces as delimiter's */
    
    paramCommand = "assume nothing expect anything";
    
    while(loc <= paramCommand.length()) {
    loc = paramCommand.find(" ", index);
    command.push_back(paramCommand.substr(index, loc));
    index = loc+1;
    }

  2. #2
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    The second parameter to basic_string::substr() is the length of the substring, not the position of the last character. Perhaps you should use it like this?
    Code:
    command.push_back(paramCommand.substr(index, loc - index + 1));

  3. #3
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    fantastic, thanks for the help

    any ideas when i call

    cin >> paramCommand;

    it does not function?

  4. #4
    Registered User hk_mp5kpdw's Avatar
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    A stringstream would be easier to use (IMO) in this instance:

    Code:
    #include <vector>
    #include <string>
    #include <sstream>
    
    ...
    
    std::vector<std::string> command;
    std::string paramCommand = "assume nothing expect anything";
    std::string temp;
    
    // Initialize stringstream using 'paramCommand' string
    std::stringstream sstr(paramCommand);
    
    // Extract individual strings from stringstream (uses spaces by default) and push onto vector
    while(sstr >> temp)
        command.push_back(temp);
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

  5. #5
    ZuK
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    Quote Originally Posted by twans
    fantastic, thanks for the help

    any ideas when i call

    cin >> paramCommand;

    it does not function?
    cin >> paramCommand; stops when it finds a space. use getline instead.
    Kurt

  6. #6
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    thanks!

    thanks heaps guys.

    very helpful

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