Difference between declaration and definition in the C language.

Hii friends,

In my this post I want to share wid you something on one of the most famous middle-level programming languages, C language.In C language, we generally come across the use of declaration and definition whether of a function, a variable or may it be structures.In case of functions and other user-defined c-tokens, this difference is clear-cut.But when it comes to the variable, both looks the same.So, the meaning of definition and declaration for variables is as follows:

Declaration: It specifies the type and name of the variable.

Definition: It specifies the type and name as well as the memory location on computer memory where the variable has been allocated storage.

Example:

                    int name;

It is a declaration of variable name.

                   extern int name;

It is a definition of variable name (excluding the case of multiple-file program).