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what is the difference between declaration and definition
of a variable or function ?
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Answer Posted / michael scofield
definition defines the memory area ( allocates the memory ) for the variable and the declaration tells about the signature of the variable ( type and size to be considered). definition occures once through the program( memory is allocated once ), but the declaration can occur many times.
OR For a variable, the definition is the statement that actually allocates memory. For example, the statement:
long int var;
is a definition. On the other hand, an extern reference to the same variable:
extern long int var;
is a declaration, since this statement doesn�t cause any memory to be allocated. Here�s another example of a declaration:
typedef MyType short;
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