ptrhell.cpp

#include<iostream.h>
#include<conio.h>

int const p = 5;// both are the same
const int q = 6;// ^
int r = 7;

int main() {
	//////////////////////////////////////////////
	/* pointer to const */
	int const *ptr = &p // both are the same
	const int *qtr = &q;// ^
	*ptr += 1; //not allowed
	/*
		ptr points to an immutable (unchangable)
		memory location
	*/
	ptr++; //allowed
	/*
		ptr currently points to an unchangable
		memory address, but it can still move
		around
	*/
	//////////////////////////////////////////////
	/* const pointer */
	int *const rtr = &r;
	*rtr += 1; // allowed
	/*
		rtr points to a mutable (changeble)
		memory location
	*/
	rtr++; // not allowed
	/*
		rtr is a constant pointer;
		it can't move around
	*/
	//////////////////////////////////////////////
	/* const pointer to const */
	const int *const str = &p;// both are the same
	int const *const ttr = &q;// ^
	*str += 1 //not allowed
	/*
		str points to an immutable (unchangable)
		memory location
	*/
	str++;
	/*
		str is a constant pointer;
		it can't move around
	*/
}