Data Structures - What is the difference between declaration and definition?

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What is the difference between declaration and definition?

Total Answers and Comments: 3

Last Update: May 09, 2008 Asked by: Kashif

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September 13, 2007 13:09:59

Xing

RE: What is the difference between declaration and def...

In case of C Functions.

Declaration: When we write the prototype of the function before using it, this is called function declaration.

Definition: When we define code for the function with the function name itself, it is called function definition.

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December 28, 2007 01:36:59

manishmodgil

Member Since: July 2006 Contribution: 15

RE: What is the difference between declaration and definition?

DECLARATION : declaration only creates the variable name and nothing exists against it. i.e no memory space is consumed.

eg. extern a;

DEFINITION : definition declares as well as assigns some value to the variable.

eg. int a;

even though we are not mentioning any value default value is provided by the C compiler.

eg. int a=10;

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May 09, 2008 08:32:13

jontyrodes

Member Since: May 2008 Contribution: 1

RE: What is the difference between declaration and definition?

Definition
int * i
i is definitionsince we can store a address without allocating memory
*i is definition since we can assign *i = 4 ;

Definition
char *c
c is definition since it can store a address of a character
*c is definition since it can store a character
Now, c is a declaration for storing a string, now i need to allocate memory to store a string..

Comments anyone ???

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