Write a program which demonstrate the arithmetic operation on pointer.

Illegal Arithmetic operation on Pointer in C++ language

In pointer arithmetic only pointer subtraction is possible and other operation link addition, multiplication, divide and modulus are not possible. i.e 

Address1  +  Address2 = Illegal

Address1  *  Address2 = Illegal

Address1  /  Address2 = Illegal

Address1 % Address2 = Illegal

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

Write a program which demonstrate the arithmetic operation on pointer.

a. program which demonstrate the subtraction operation on pointer

#include<iostream>

using namespace std;

int main()

{

int x=10, y=20;

int *ptr1 = &x;

int *ptr2 = &y;

cout<<"Difference between ptr2 and ptr1 is :"<< ptr2-ptr1;

return 0;
}

The above program output is tested on www.jdoodle.com

Output:

Address of ptr1 is :0x7ffd55431770

Address of ptr2 is :0x7ffd55431774

Difference between ptr2 and ptr1 is :1

b. program which demonstrate the addition operation on pointer

#include<iostream>

using namespace std;

int main()

{

int x=10, y=20;

int *ptr1 = &x;

int *ptr2 = &y;

cout<<"Difference between ptr2 and ptr1 is :"<< ptr2+ptr1;

return 0;
}

The program output is tested on www.jdoodle.com

Output:

jdoodle.cpp: In function 'int main()':

jdoodle.cpp:12:54: error: invalid operands of types 'int*' and 'int*' to binary 'operator+'

 cout<<"Difference between ptr2 and ptr1 is :"<< ptr2+ptr1;

c. program which demonstrate the multiplication operation on pointer

#include<iostream>

using namespace std;

int main()

{

int x=10, y=20;

int *ptr1 = &x;

int *ptr2 = &y;

cout<<"Difference between ptr2 and ptr1 is :"<< ptr2*ptr1;

return 0;
}

The program output is tested on www.jdoodle.com

Output:

jdoodle.cpp: In function 'int main()':

jdoodle.cpp:12:54: error: invalid operands of types 'int*' and 'int*' to binary 'operator*'

 cout<<"Difference between ptr2 and ptr1 is :"<< ptr2*ptr1;

Thanks

Mukesh Rajput