Pointers
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About
A pointer is a data type whose value refers directly to (or "points to") another value stored elsewhere in the computer memory using its address. Obtaining the value to which a pointer refers is called dereferencing the pointer.
Learning how to use pointers properly is one of the harder things to learn in programming - and incorrect use of pointers can cause many nightmares.
Examples
EXAMPLE ONE:
#include <iostream>
using namespace std;
int main ()
{
int firstvalue, secondvalue;
int * mypointer;
mypointer = &firstvalue;
*mypointer = 10;
mypointer = &secondvalue;
*mypointer = 20;
cout << "firstvalue is " << firstvalue << endl;
cout << "secondvalue is " << secondvalue << endl;
return 0;
}OUTPUT:
firstvalue is 10 secondvalue is 20
