Difficult C++ pointer question, PLEASE HELP!!!!?

I'm reading this tutorial on c++, apparently when you define a pointer to be const, the address of that pointer can not be changed. However the below code defines a pointer as const called pointer and points to the address of variable a1, however i then give the pointer a new address (variable a2). I'm really confused because point was declared as a constant, yet a can change the address of the pointer and the program compiles with out any errors. can any body explain to whats happening and y my theory isn't working?

#include<iostream>

int main()

{

int a1 = 1, a2 = 2;

int const *point = 0;

point = &a1;

std::cout<<*point<<'\n';

point = &a2;

std::cout<<*point<<'\n';

system("pause");

return 0;

}

output:

--------

press any key to continue........

Difficult C++ pointer question, PLEASE HELP!!!!?c++ runtime error

the compiler interprets

int const *point

const int *point

which mean it is a pointer to a constant integer.

change it to

int * const point

will cause the pointer point to not be changed.

Difficult C++ pointer question, PLEASE HELP!!!!?c++ standard

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Difficult C++ pointer question, PLEASE HELP!!!!?

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