appending a int to a variable in a loop?

This is a discussion on appending a int to a variable in a loop? within the C++ Programming forums, part of the General Programming Boards category; say i run my app. prog.exe test1 test2 test3 to save using.. string arg1=argv[1] etc etc how can i use ...

  1. #1
    wario
    Guest

    appending a int to a variable in a loop?

    say i run my app.

    prog.exe test1 test2 test3

    to save using..

    string arg1=argv[1] etc etc

    how can i use this loop to append "i" to the end of "arg"..

    for(int i=1;i<argc;i++)
    {
    string arg? = argv[i];
    }

    ? should be the number of "i".
    how can i add this to the end of "arg" ?
    thanks

  2. #2
    Pursuing knowledge confuted's Avatar
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    You can use an array of strings. That's all you can do.
    Away.

  3. #3
    Registered User
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    1,109
    You can use the resize() function of the string class. i.e.
    Code:
    #include <iostream>
    #include <string>
    
    int main() {
      string arg;
      int i;
      int argv[50];
    
      for(i = 0; i < 50; i++) {
        arg.resize(arg.length() + 1);
        arg[arg.length() - 1] = argv[i];
      }
    
      return 0;
    }
    I haven't tested it, but I think it should work. I hope this was what you were looking for.

  4. #4
    Toaster Zach L.'s Avatar
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    Just looking at that (I'm too lazy to test for sure at the moment), I don't think that'll do what you want.

    The operator[] for std::string returns a reference to a character. Assigning that character to an int will cause the int to be cast to a char (simply truncated if necessary), and then you'll end up appending the character corresponding to that number in the ASCII table.

    There is an IntToString function in the FAQ (here), and then you could simply use the operator+= for string.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  5. #5
    Toaster Zach L.'s Avatar
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    Hmm... Looking back at the question (and blackrat's reply), I think something more like this is what your looking for:

    Code:
    std::vector<std::string> arg(argc);
    
    for(int i = 0; i < argc; ++i)
    {
       arg[i] = argv[i];
    }
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  6. #6
    Registered User
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    wow, I completely forgot about that. Geeze, not a good day for me.

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