C parsing

This is a discussion on C parsing within the C Programming forums, part of the General Programming Boards category; So, here's what I'm wondering if you guys can help me with: I'm fairly new to coding C and I ...

  1. #1
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    C parsing

    So, here's what I'm wondering if you guys can help me with: I'm fairly new to coding C and I might just be missing a function, so if so this should be easy.

    Here's the problem, or, at least, what I need my program to do.
    User enters a string, optionally containing a symbol. So, like, "$." I need my program to parse out the string that directly follows it (excluding whitespace) and store it in a char.

    So, if "user" entered "hello, my name is $bob what is yours?", the program would return "bob" to a character.

    If this post is redundant, I apologize- I looked and didn't find anything similar.

    I would greatly appreciate any help.

  2. #2
    Deathray Engineer MacGyver's Avatar
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    First step in finding the '$' is using strchr(). The next step depends upon what you want the program to do. You could manually search through the rest of the string char by char until you find a character to stop at. Finally, after knowing the start and end of the substring, you could strcpy() it to a new malloc()'ed buffer and do whatever you want with it (remembering to free() the buffer later on).

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    Ugly C Lover audinue's Avatar
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    Try to learn advance topics: Automata, is a good way to parse something.

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    Quote Originally Posted by MacGyver View Post
    First step in finding the '$' is using strchr(). The next step depends upon what you want the program to do. You could manually search through the rest of the string char by char until you find a character to stop at. Finally, after knowing the start and end of the substring, you could strcpy() it to a new malloc()'ed buffer and do whatever you want with it (remembering to free() the buffer later on).
    Well, what I need it to do is automatically pick out the string that follows the symbol I am searching for.

    Now.... I think I may have something here, and I was wondering if you guys could help me a little further? What my newest idea is was to use strtok() to split up input into a series of tokens using the ' ' character. Sooo... "hello, my name is $bob what is yours" would be split up into each of the individual words. However, in what way can I later search each individual token for the "$" character? Also, if I am going about this in the completely wrong way, please- someone tell me?

  5. #5
    Ugly C Lover audinue's Avatar
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    Traditional parsing example:
    Code:
    char c;
    
    while((c = getchar()) != EOF)
    {
        if(c == '$')
        {
            while(isalpha(c = getchar()))
            {
                putchar(c);
            }
    
            putchar('\n');
        }
    }
    Input:
    Code:
    hello my name is $bob what is yours? hi! my name is $angela, nice to meet you
    Output:
    Code:
    bob
    angela
    Is this help?

  6. #6
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    Yep. Thanks.

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