//Pointer Arithmetic 
#include<stdio.h> 
int main() 
{ 
	int arr[]={1,2,3,4,5,6,7,8,9}; 
	int *p1,*p2; 
	p1=arr; 
	p1++;// p1 will point towards next memory location 
	printf("%d",*p1);//2 will be displayed 
	
	p1--;//p1 will point towards previous memory location 
	printf("\n%d",*p1);// 1 will be displayed 
	
	p1=p1+2;// Adding a constant to pointer(p1 will point towards 3rd element) 
	printf("\n%d",*p1);// 3 will be displayed
	
	p1=p1-2;//Subtracting a constant from a pointer(P1 will point towards first element) 
	printf("\n%d",*p1);// 1 will be displayed 
	
	p2=&arr[4]; 
	printf("\n%ld",p2-p1);//Subtracting two pointers(Returns 4(no. of elements b/w+1)(Pointers pointing to the same array) 
    
    //Comparing two pointers 
	while(p1<=p2) 
	{ 
		printf("\n%d",*p1);//Comparison of two pointers (Pointers pointing to the same array) 
		p1++; 
	} 
	//Following are the invalid arithmetic operations(Not allowed on pointers) 
	//printf("\n%d",p1+p2);//Invalid arithmetic 
    //printf("\n%d",p1/p2);//Invalid arithmetic 
    //printf("\n%d",p1*p2);//Invalid arithmetic 
	//printf("\n%d",p1%p2);//Invalid arithmetic 
    //printf("\n%d",p1*2);//Invalid arithmetic 
    //printf("\n%d",p1/2);//Invalid arithmetic 
    //printf("\n%d",p1%2);//Invalid arithmetic 
	return 0; 
}