C comparing two pointer variables

In the previous chapter we have learnt about computing the difference between two pointer variables, In this chapter we will be learning how two pointers can be compared ?

Comparison between two Pointers :

1. Pointer comparison is Valid only if the two pointers are Pointing to same array
2. All Relational Operators can be used for comparing pointers of same type
3. All Equality and Inequality Operators can be used with all Pointer types
4. Pointers cannot be Divided or Multiplied

Point 1 : Pointer Comparison

#include<stdio.h>
int main()
{
int *ptr1,*ptr2;
ptr1 = (int *)1000;
ptr2 = (int *)2000;
if(ptr2 > ptr1)
   printf("Ptr2 is far from ptr1");
return(0);
}

Pointer Comparison of Different Data Types :

#include<stdio.h>
int main()
{
int *ptr1;
float *ptr2;
ptr1 = (int *)1000;
ptr2 = (float *)2000;
if(ptr2 > ptr1)
   printf("Ptr2 is far from ptr1");
return(0);
}

Explanation :

• Two Pointers of different data types can be compared .
• In the above program we have compared two pointers of different data types.
• It is perfectly legal in C Programming.

Following operations on pointers :

Divide and Multiply Operations :

#include<stdio.h>
int main()
{
int *ptr1,*ptr2;
ptr1 = (int *)1000;
ptr2 = ptr1/4;
return(0);
}

Output :

In the next chapter we will be learning different invalid or illegal arithmetic operations performed on the pointer.