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advantages of functions!

This is a discussion on advantages of functions! within the C Programming forums, part of the General Programming Boards category; What are the advantages of using functions in c programming? eg what advantage does putting a maths equation in a ...

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    advantages of functions!

    What are the advantages of using functions in c programming? eg what advantage does putting a maths equation in a function have compared with putting it in the main body of code!

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    For one, if the function is needed multiple times, you save on code size (no repeated code) by using a function. Which would make for easier maintainability of the code.

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    Quote Originally Posted by yellowmania View Post
    What are the advantages of using functions in c programming? eg what advantage does putting a maths equation in a function have compared with putting it in the main body of code!
    It is all about suitable abstraction.
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    Quote Originally Posted by yellowmania View Post
    What are the advantages of using functions in c programming? eg what advantage does putting a maths equation in a function have compared with putting it in the main body of code!
    Modularity...

    Create and test a function once, use it multiple times throughout your code.

    Local variables are contained and valid only as needed.

    Activity inside the function does not impact code outside the function.

    Need to change the calculation? Change it in one place, recompile, and everything is updated.

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    And just think about functions you already use: imagine if you had to rewrite the entire code for printf() in main() every time you wanted to print some text on the screen. Pretty ridiculous! Where would you even start?
    Salem and iMalc like this.

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    Quote Originally Posted by yellowmania View Post
    What are the advantages of using functions in c programming? eg what advantage does putting a maths equation in a function have compared with putting it in the main body of code!
    Look at it one way, you are making a simple program that adds two numbers (i.e. c = a + b).

    And let's say, you are doing it in multiple places, and for arguments sake lets say you added 1,000 numbers, and your code is now 50,000 lines long.

    Now you are running the program and find out that the calculation is off.

    The question is now, which one of the 1,000 (c = a + b) did you screw up and where in the 50,000 lines of code is the mistake at? With a function it allows you to change your code at one spot vs multiple spots.

    That is one example, but there a numerous other examples.

    And FYI - The question sounds a lot like a HW question. If you were in need of a HW question being answered, read your text book first. The answer would have been within the first couple of pages on your chapter about functions.
    Last edited by Strahd; 12-01-2011 at 09:49 AM.

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    One advantage is that you can give a better idea of how your programme works!

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    Quote Originally Posted by mdj441 View Post
    And just think about functions you already use: imagine if you had to rewrite the entire code for printf() in main() every time you wanted to print some text on the screen. Pretty ridiculous! Where would you even start?
    You know what, before I read this, it was exactly what I was going to write myself!
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