Please Help!!! Validation loop for postcode!!

This is a discussion on Please Help!!! Validation loop for postcode!! within the C++ Programming forums, part of the General Programming Boards category; I was wondering if you could help me as I am new to c++ I need to validate a postcode ...

  1. #1
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    Please Help!!! Validation loop for postcode!!

    I was wondering if you could help me as I am new to c++

    I need to validate a postcode using the following functions


    1. Write a function called isValidPostcode:

    Prototype: bool isValidPostcode(char postcode[])
    Parameter: character string (postcode).
    Return value: returns true if the postcode is valid, false otherwise.
    Functionality: works out whether the given postcode is valid or invalid.

    I don't know where to begin! please help me asap and I will be forever grateful

    thanks

  2. #2
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    Compiler: gcc

  3. #3
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    The first place to begin is to lay out the rules, in english, of what a valid postcode is. For example, in the US, a 5 digit number is a valid postcode, as is the 5-4 format. Once you have the rules, you can implement the checking for those rules in code.

  4. #4
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    Okey I have set out the rules. Its a british postcode so it goes AAN NAA. Any more tips on where to go now? Any help at all is welcome. Thanks

  5. #5
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    Does A stand for any alphabetic character? Does N stand for any numeric character?

    How would you validate the postcode in real life? Write out the steps. For example, here is how I would validate an American zip code that takes the format NNNNN-NNNN:

    1. Check the length of the string, it must be 10 characters. If not - invalid.
    2. For each character in the string:
    2a. If it is the 6th character in the string (index #5), it must be the '-' character. If not - invalid.
    2b. Otherwise if it is not the 6th character, it must be a numeric character. If not - invalid.
    3. If the first 2 checks succeed, the zip code is valid.

    If you can do that for your post code, it is real close to actual code.

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