Differencing or Subtracting Pointer in C Programming Language

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Differencing Pointer in C Programming Language :

1. Differencing Means Subtracting two Pointers.
2. Subtraction gives the Total number of objects between them .
   
3. Subtraction indicates "How apart the two Pointers are "

Example :

int n , *p ,*q ;
// P stores the address of Variable n
p = &n ; 
// Value of q is incremented by 4 bytes
q = p + 2 ;  
// Differencing two Pointers
printf("%d",q-p); 

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Output : 2

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Observations & Explanation : 

1. Numerically Subtraction ( q-p ) differs by 4
2. As both are Integers they are numerically Differed by 4 and Technically by 2 objects
3. Suppose Both pointers of float the they will be differed numerically by 8 and Technically by 2 objects

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Tags / Keywords : | Pointer : Subtraction

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