Submitted by Anonymous (not verified) on Sun, 03/10/2013 - 01:25

    Q What is the main difference between a function declaration and a function definition?

    A The main difference between a function declaration and a function definition is that the former does not reserve any memory space, nor does it specify what a function does. A function declaration only alludes to a function definition that is placed elsewhere. It also specifies what type of arguments and values are passed to and returned from the function. A function definition, on the other hand, reserves the memory space and specifies tasks the function can complete.

    Q Why do we need function prototypes?

    A By declaring a function with prototypes, you specify not only the data type returned by the function, but also the types and names of arguments passed to the function. With the help of a function prototype, the compiler can automatically perform type checking on the definition of the function, which saves you time to debug the program.

    Q Can a function return a pointer?

    A Yes. In fact, a function can return a single value that can be any data type except an array or a function. A pointer value—that is, the address—returned by a function can refer to a character array, or a memory location that stores another type of data. For instance, the C library function asctime() returns a character pointer that points to a character string converted from a date-time structure.

    Q Can you use top-down programming and bottom-up programming together to solve a problem?

    A Yes. In practice, you can find that it's actually a good idea to combine the top-down and bottom-up programming approaches to solve problems. Using the two types of structured programming can make your program easy to write and understand.

 

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Programming Style

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In this section, I'd like to briefly highlight some points that will help you write clean programs that can easily be read, understood, and maintained.

Exercises : Answer the following Question

To help solidify your understanding of this hour's lesson, you are encouraged to answer the quiz questions and finish the exercises provided in the Workshop before you move to the next lesson.

Question and Answer

    Q Is the C preprocessor part of the C compiler?

    A No. The C preprocessor is not part of the C compiler. With its own line-oriented grammar and syntax, the C preprocessor runs before the compiler in order to handle named constants, macros, and inclusion of files.

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