Thread: Advice on validating input

  1. #1
    unleashed alphaoide's Avatar
    Join Date
    Sep 2003

    Advice on validating input

    I need to validate input for name, address etc. This is how I'm gonna go about doing it.

    1) name (broken down into first, middle, last) input has to be all letters.
    2) address line1 and 2: has to be digits, letters, or space
    I might want to elaborate that first portion is digits and the rest letters, space i.e 200 First Ave
    3) city, state: letters, space
    4) zip: 5 digits

    The inputs are gonna be string type and will be read like this.
    void Person::setFirstName(const string fn) {
    int charValue;
    int strLength = fn.size();
    int count = 0;
    bool invalidChar = false;
        charValue = (int)fn[count];	// reads the ASCII equivalence
        if ((charValue < 65 || bla...bla..bla.. { // not a letter
            invalidChar = true;
    } while (count < strLength && invalidChar != true);
        if (invalidChar == false) {
            firstName = fn;
        else {
            firstName = "XXXX";
    What do you guys think? any suggestion welcomed

  2. #2
    Registered User major_small's Avatar
    Join Date
    May 2003
    look up c-style strings, for example, isdigit(),isalpha(),isalnum()

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  3. #3
    Toaster Zach L.'s Avatar
    Join Date
    Aug 2001
    Boost ( also has a regular expressions library... though that may be overkill.
    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.

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