Get length of string as integer

This is a discussion on Get length of string as integer within the C++ Programming forums, part of the General Programming Boards category; I have an input file that has data in for format: 1 asdfhboais so its an integer followed by a ...

  1. #1
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    Nov 2004
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    Get length of string as integer

    I have an input file that has data in for format:
    1 asdfhboais
    so its an integer followed by a group of characters. I need to figure out how many characters there are. Then access them one at a time to compare them. I tried to save them to a string and check, like so:
    Code:
    int number, len;
    string letters;
    cin >> number >> letters;
    len = letters.length();
    but I get a warning because the string.length() function returns an unsigned integer. I need to use the length later as an int. Is there a good way to do what I need. Thanks!

  2. #2
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    Use size_t or an unsigned int, or just ignore the warning. Converting from unsigned int to signed int only matters if the value is greater than the largest positive value that a signed int can hold, and that almost certainly will not be the case if you are counting letters like that. If you don't want the warning you can cast the result to a regular int:

    len = static_cast<int>(letters.length());

  3. #3
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    wow that was super fast. Thanks!
    static_cast, I knew I forgot something important.

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