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Re: Trying to understand pointers. Why does this give unexpected results?

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rob <rob@drrob.com> writes:

> This is my test program
>
> #include everything relevant here
> int main {

And you need ()s there and at least a "using namespace std;" unless you
are using a museum version of C++.

>   int a = 0;
>   float b = 1.0;
>   char c = 'c';
>
>   int *ptrA;
>   float *ptrB;
>   char *ptrC;
>
>   ptrA = &a;
>   ptrB = &b;
>   ptrC = &c;
>
>   cout << "value of a: " << a << "; address of a: "  << ptrA << endl;
>   cout << "vaue of b: " << b << "; address of b: " << ptrB << endl;
>   cout << "value of c: " << c << "; address of c: " << ptrC << endl;

What would you like this code to do:

   char *string = "Hello world\n";
   cout << string;

?  Can you see the problem now?

>   return 0;
> }
>
>
> This program, compiled w/ gcc 9.3 on Pop_OS 20.04, does not print an
> address for c.  It just prints "c"; this does show addresses for a and
> b.
>
> Why can't I show the address for the char variable c?

You can if you do this:

  cout << "value of c: " << c << "; address of c: " << (void *)ptrC << endl;

-- 
Ben.

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Thread

Trying to understand pointers.  Why does this give unexpected results? rob <rob@drrob.com> - 2021-07-03 16:12 -0400
  Re: Trying to understand pointers.  Why does this give unexpected results? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-03 21:27 +0100
    Re: Trying to understand pointers.  Why does this give unexpected results? rob <rob@drrob.com> - 2021-07-03 17:54 -0400
      Re: Trying to understand pointers. Why does this give unexpected results? Real Troll <real.troll@trolls.com> - 2021-07-03 22:04 +0000
        Re: Trying to understand pointers. Why does this give unexpected results? "Fred. Zwarts" <F.Zwarts@KVI.nl> - 2021-07-15 09:45 +0200
  Re: Trying to understand pointers.  Why does this give unexpected results? Juha Nieminen <nospam@thanks.invalid> - 2021-07-08 08:17 +0000

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