Re: string array v.s. int array

From:
=?Utf-8?B?R2Vvcmdl?= <George@discussions.microsoft.com>
Newsgroups:
microsoft.public.vc.language
Date:
Wed, 12 Dec 2007 00:05:02 -0800
Message-ID:
<BFE397F8-A781-4F96-897D-7DB91CE12CE3@microsoft.com>
Great cd!

regards,
George

"Carl Daniel [VC++ MVP]" wrote:

George wrote:

wchar_t me[] = L"Hello World \n";

....

int values[] = { 10, 20, 30, 40, 55, 60, 70, 80, 90, 100 };


On top of all of the other fine answers, one thing stood out at me as
something you're possibly unclear on: You do not have an array of string
and an array of int. Rather, you have an array of char and an array of int.

std::ostream "helps" you by supplying an overloaded operator << that, given
a char*, pulls a zero-terminated string from that address, while an int*
sent to an ostream will simply yield the address of the array since there's
no overloaded operator << that accepts an int*, so it matches the overload
for void*. If you were to cast the pointer to your char array to a void*,
thus disabling the overload for char*, you'd get identical treatment for the
two cases:

[Code]
#include <iostream>
#include <string>

using namespace std;

int main()

{
    wchar_t me[] = L"Hello World \n";
    wchar_t (*me2_ptr)[14] = &me;
    wcout << (void*)*me2_ptr << endl; // output Hello World
    wcout << **me2_ptr << endl; // output H

    int values[] = { 10, 20, 30, 40, 55, 60, 70, 80, 90, 100 };
    int (*pval)[10] = &values;
    wcout << *pval << endl; // output 0x0017f6f0
    wcout << **pval << endl; // output 10

    return 0;
}
[/Code]

-cd

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