ConstPointers.cpp

#include<iostream>

//const pointers

using namespace std;

int main()
{
	int x=10,y=20;
	 int* const  ptr = &x;//a read-only pointer which refers to x, now ptr value cannot be changed i.e it cannot refer to any other variable
	

	
	
	*ptr=20;
//	x=20; //can be done
	// ptr=&y;// COMPILE TIME ERROR-cannot change value of the pointer as its is read-only/constant
	
		
	
	 
	cout<<x<<endl;// output=10
	//cout<<++*ptr produces error as *ptr is read-only i.e const and its value cannot be changed
	cout<<&x<<endl; // output-memory address of x
	cout<<ptr<<endl; // output-memory address of ptr
	
	cout<<++x<<endl;//first increment then print-x becomes = 11
	cout<<x++<<endl;//output-11 as first it prints then increments value of x to 12
	cout<<x;//now prints 12
	return 0 ;
}