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What is the address of buf (local variable in main function)?

I was doing programming in C classes and I asked the question:

What is the address of buf (local variable in main function)? Enter your answer in hexadecimal (0x followed by 8 "digits" 0-9 or af, such as 0xbfff0014) or decimal. Note that we want the buf address, not its contents.

the code looks like this:

int main(int argc, char *argv[]) {

   while(1) {
       char  buf[1024] = {0};
       int r;
    ....

So I ran gdb

and just put a breakpoint on the line char buf[1024]

and typedgdb 

 p &buf

and this gives me the result: 0xbffff0f0

but when I use this number in this quiz it gives me the result that this value is not correct.

My question is: is this (p & buf) the address of the buf variable? Or if not, why not?

The exercises are done on a prepared VirtualBox machine, so I think everyone should have the same addresses

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1 answer


There is no correct numeric answer. The address can change from one time to the next. This is the programming exercise you are talking about. The next three statements gave me the same address.



printf ("0x%08x\n", buf);
printf ("0x%08x\n", &buf[0]);
printf ("0x%08x\n", &buf);
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