C Pointer Arithmetic

C programming allow programmers just like you to do arithmetic operations using pointers. So, programmers can perform any arithmetic operations using pointer variables. Performing arithmetic operations using pointer variables is said to be arithmetic pointer.

C Program - Pointer Arithmetic

#include <stdio.h>
int main()
{
int a = 10, b = 6;
int *ptr, *ptr1;
ptr = &a;
ptr1 = &b;
printf("sum of two pointers : %d \n", *ptr+b);
printf("Subtraction of two pointers : %d \n", a-*ptr1);
return 0;
}

Incrementing Pointer variable

Suppose if your interviewer ask you to display the value stored in an array without using any index value. Then Pointer will help you to get there by using increment operator.

Program - Incrementing Pointer variable

#include <stdio.h>
int main()
{
int arr[3] = {10, 11, 12};
int *ptr, i;
ptr = arr;
for(i = 0; i < 3; i++)
{
printf("%d\t", *ptr);
ptr++;
}
return 0;
}

Decrementing Pointer Variable

Suppose if your interviewer ask you to display the value stored in an array in reverse order by providing you with the address of last value in an array and restricting not to using index value iteratively. Then Pointer will help you to get there by using decrement operator.

Program - Decrementing Pointer variable

#include <stdio.h>
int main()
{
int a[3] = {10, 11, 12};
int *ptr, i;
ptr = &a[2];
for(i = 3; i > 0; i--)
{
printf("%d\t", *ptr);
ptr--;
}
return 0;
}

Comparing Pointer Variable

Pointer variable can be compared either with other pointer variable or with normal variable. Relational operators will get you there for comparison operation. Let us using greater than operator to compare two pointer variables.

Program - Comparing Pointer variable

#include <stdio.h>
int main()
{
int a = 10, b = 6;
int *ptr, *ptr1;
ptr = &a;
ptr1 = &b;
if(*ptr > *ptr1)
printf("value stored in a is greater than b ");
else
printf("value stored in b is greater than a ");
return 0;
}

Did You Know?

Pointer variable can be used for all sort of operations like addition, subtraction, division, passing value and even more as we do with normal variable. But pointer variable can play with address of memory which cannot be done using normal variable is the only difference.

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