//* Demonstration of pointer properties and pointer arithmetic *
#include <iostream>
using namespace std;

int main() {
    cout <<"Pointers to variables"<<endl;
    double a;
    double * b;
//  cout<<&a<<"\t"<<b<<"\t"<<a<<"\t"<<*b<<endl; // *b crashes, a & b not initialized warning
    a=101;
    b=&a;
    cout<<&a<<"\t"<<b<<"\t"<<a<<"\t"<<*b<<endl;
    a=102;
    cout<<&a<<"\t"<<b<<"\t"<<a<<"\t"<<*b<<endl;
    *b=103;
    cout<<&a<<"\t"<<b<<"\t"<<a<<"\t"<<*b<<endl;
    b=(double*)104;
    cout<<&a<<"\t"<<b<<"\t"<<a<<endl; // *b crashes

    cout <<"Pointers to arrays, pointer++ and --"<<endl;
    double c[3]={201,202,203};
    double *d;
    d=c;
    cout<<c<<"\t"<<d<<"\t"<<*d<<"\t"<<d[0]<<"\t"<<d[1]<<"\t"<<d[2]<<endl;
    d++;
    cout<<c<<"\t"<<d<<"\t"<<*d<<"\t"<<d[0]<<"\t"<<d[1]<<"\t"<<d[2]<<endl; // d[2] might crash 
                             // if no other variable owned by this program is placed after it
    d++;
    cout<<c<<"\t"<<d<<"\t"<<*d<<"\t"<<d[0]<<"\t"<<d[1]<<"\t"<<d[2]<<endl; // d[1] might crash 
                         // too if no other variable owned by this program is placed after it
    
    cout <<"Mixing pointer types is bad"<<endl;
    double e;
    int * f;
    e=301;
    f=(int*)&e;
    cout<<&e<<"\t"<<f<<"\t"<<e<<"\t"<<*f<<endl;
    *f=302;
    f++;
    *f=303;
    cout<<&e<<"\t"<<f<<"\t"<<e<<"\t"<<*f<<endl;

    return(0);

}