question about parser??

This is a discussion on question about parser?? within the C++ Programming forums, part of the General Programming Boards category; Hi, I am still new to C++ and have a quick question: what exactly is a parser?? Thanks for any ...

  1. #1
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    question about parser??

    Hi,

    I am still new to C++ and have a quick question:

    what exactly is a parser??

    Thanks for any explanations.

  2. #2
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    To parse something means to break it into smaller pieces. For example, say you have the string:

    Hello world!

    You can parse this string into two substrings based on the space between the two words. You can parse it into 4 three letter strings if you want. You can parse it into 12 individual charactters if you prefer. You can parse it into three strings using the character '0' as a delimiter. You can parse it into 4 strings using the character 'l' as a delimiter. etc. etc. etc.

    As another example you can parse an int like: 321
    into three individual ints using a sequence of % and / in combination.

    int num = 321;
    int parsed[3];
    parsed[2] = num % 10;
    num /= 10;
    parsed[1] = num % 10;
    num /= 10;
    parsed[0] = num;

    for(int i = 0; i < 3; ++i)
    cout << num << endl;

    You have to decide how you want to break down (parse) whatever it is you want to parse. A parser is a routine that does the parsing.
    Last edited by elad; 07-30-2003 at 09:28 AM.

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