Differencing or Subtracting two Pointer in C Programming Language

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 :

#include<stdio.h>

int main()
{
int num , *ptr1 ,*ptr2 ;

ptr1 = &num ;
ptr2 = ptr1 + 2 ;

printf("%d",ptr2 - ptr1);

return(0);
}

Output :

 2

• ptr1 stores the address of Variable num
• Value of ptr2 is incremented by 4 bytes
• Differencing two Pointers

Observations & Explanation :

1. Numerically Subtraction ( ptr2-ptr1 ) 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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