Re: A simple query about memory mgmt

[Johannes Weiner <hannes@xxxxxxxxxxxx>]

Hi,

"Belisko Marek" <marek.belisko@xxxxxxxxx> writes:

> On Tue, Aug 12, 2008 at 7:28 PM, Santosh Pradhan
> <santosh.pradhan@xxxxxxxxx> wrote:
>> Hi All,
>> I am new to this group and I have a question regarding following C program.
>>
>> #include<stdio.h>
>>
>> #define NAME "santosh"
>>
>> int main()
>> {
>>     char *p_name = NAME;
>>     char *q_name = NAME;
>>     if (p_name == q_name)
>>          printf("Hello, World\n");
>>     return 0;
>> }
>>
>> When I compile this test program, it always prints "Hello, World".
>>
> Both pointers point to same address (NAME) that's the reason why you
> always get Hello World in output. :)

You might run cpp over this code and rethink your answer :)

>> My Question:
>>
>> i) Does compiler do any optimization automatically to make both the pointers
>> have same address ?
>>
>> ii) How does this happen?
> You can debug your code in e.g Kdevelop and see exactly what happens.
>>
>> iii) Will both the pointers be same always?
> Yes, both point to same variable.

That's incorrect, "santosh" is not a variable.

	Hannes

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