#include <stdio.h>
#include <stdlib.h>

//Ponters are variables which refer to the memory locations of other variables

int main()
{		
	int cost = 5;	
	int* cost_ptr; //Address of a chunk of memory for one or more integer(s)	
	int i;	
		
	//& operator: get the address at which the variable is stored.	
	cost_ptr = &cost; //Let cost_ptr point to "cost"

	//* operator: get the contents of the address held in variable
	printf("Pointer = %d. Dereference = %d\n", cost_ptr, *cost_ptr);	
	
	//Allocate a memory for 10 integers. Make "cost_ptr" be the address of allocated memory
	cost_ptr = (int*) malloc( 10 * sizeof(int)); 

	//cost_ptr can be used as an array variable of multiple integers
	for (i = 0; i < 10; i++)
	{		
		cost_ptr[i] = i*2; 
		printf("value %d: %d\t", i, cost_ptr[i]);

		//You can also explicitly use the memory locatioin of ith integer.
		// You should probably not attempt this.
		*(cost_ptr + sizeof(int) * i) = 2*i  ;
		printf("value %d: %d\n", i, *(cost_ptr + sizeof(int) * i));
	}

	//Free the allocated mormory if you don't use it in the future
	free( cost_ptr);

	return 0;
}