what is the difference between declaration and definition of a variable or fun

what is the difference between declaration and definition
of a variable or function ?

Question Posted / prakashdasari

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what is the difference between declaration and definition of a variable or function ?..

Answer / suman_kotte

declares a function, but that does not define it.
declaration describes whether the function consist
arguments or not and also it will return a value or not.

definition must be as per the function declaration that was
declared rearlier.it will for the out put of that function.

ex;

main()
{
int a=1,b=2;
void sum(int , int );//declaration
sum(a,b);
}
void sum(int x, int y)//definition
{
printf("%d",x+y);
}

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what is the difference between declaration and definition of a variable or function ?..

Answer / 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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4 Yes

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what is the difference between declaration and definition of a variable or function ?..

Answer / ashu_deepu

i will like to add 1 thing abt d variabes.

declaring a variable means
int deepu; //it is declaration

defining means assigning value to the variable.

eg: int deepu=2018; //it is definition

Is This Answer Correct ?

4 Yes

5 No

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