/*------------------------------------------------
 signature: main: void -> int
 purpose: to play with pointers

 examples: when you run this program,
     the following should be printed to the
     screen:
num_ptr is: <an address>
*num_ptr is: 13.7
weight is: 13.7

num_ptr is: <same address>
*num_ptr is: 25.8
weight is: 25.8

num_ptr is: <same address>
*num_ptr is: 42
weight is: 42

by: Sharon Tuttle
last modified: 12-3-10
------------------------------------------------*/

#include <iostream>
using namespace std;

int main()
{
    double *num_ptr;
    double weight = 13.7;

    num_ptr = &weight;

    cout << "num_ptr is: " << num_ptr << endl;
    cout << "*num_ptr is: " << *num_ptr << endl;
    cout << "weight is: " << weight << endl;
    cout << endl;

    *num_ptr = 25.8;

    cout << "num_ptr is: " << num_ptr << endl;
    cout << "*num_ptr is: " << *num_ptr << endl;
    cout << "weight is: " << weight << endl;
    cout << endl;

    weight = 42;

    cout << "num_ptr is: " << num_ptr << endl;
    cout << "*num_ptr is: " << *num_ptr << endl;
    cout << "weight is: " << weight << endl;

    return EXIT_SUCCESS; 
}