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How to differentiate b/n definition and declaration?

Some useful difference b/n definition and declaration are given below:

When define an object not only its attribute are made known,but its object are also created.Where as when we declare an object only its attribute are made known. 
We define object like;
long int lSum; 
long int lCount;
void SumInt(int nItem)
   lSum =lSum + (long)nItem;

We declare an object like;
void VFunction(int nType)
   int nTest;
   nTest = nType;

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