Answer Posted / dally

defination is allocating memory to the variable.
but declaration is telling what type of variable it is and
not allocating memory for it.

Ex.int i;
extern int b;

here int i is definition because variable of value is
allocated in memory.
but variable b declared as int variable but memory is not
allocated for this.

float y is defination as compiler allcates memory for it
if you give as extern float y it is declaration

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