Write a program which perform the difference operation on pointer variables.

Some C++ program which perform the pointer operations in C++ language:

Note: If you subtract two pointers result will be a number but number will not be a simple mathematical subtraction of two addresses but it follow some rules:

If two pointers are of same type then:

Address2 - Address1 = (simple subtraction of two address) / Size of datatype which pointer points.

1. Write a program which perform the difference operation on pointer variables.

#include<iostream>

using namespace std;

int main()

{

int x=10;

int *ptr = &x;

int *temp;

temp = ptr;

// Here we increment the pointer with 1, means pointer is incremented with memory size 8 byte (4 for each int)

ptr = ptr + 2;

cout<<" Address of temp is : "<< temp;

cout<<endl;

cout<<" Address of pointer is : "<< ptr;

cout<<endl;

cout<<" Difference : "<< ptr - temp;

cout<<endl;

return 0;

}

Explanation: Here two pointer ptr and temp are of same type and both are pointing to int datatype variable.

ptr-temp = (0x7fff6ecf0bcc - 0x7fff6ecf0bc4 ) sizeof(int)

                  = 8/4 

                  = 2.

The output of this program is tested on www.jdoodle.com

Output:

Address of temp is : 0x7fff6ecf0bc4

Address of pointer is : 0x7fff6ecf0bcc

Difference between ptr and temp : 2

Thanks

Mukesh Rajput