Re: Antwort: Re: [Dev-C++] What's the difference?

[Daniel G. <sp...@ho...>]

Read it as "the address of" if you are using pointers. for example

int NumberOfEmails = 7;

// Create a pointer, QuantityOfEmails, and make it point to
// the (memory) address of NumberOfEmails.
int* QuantityOfEmails = &NumberOfEmails;

So now we can do

std::cout << *QuantityOfEmails << std::endl;   // Outputs '7' to screen




If you are using it with functions...


void FunctionA(int& FreshInt)
{
  FreshInt = 10;
}



It means the function takes a REFERENCE to the integer passed in, i.e. any 
change made in the function affects the original. So the following  code

// Change the ORIGINAL
void FunctionA(int& FreshInt)
{
  FreshInt = 10;
}

and

// Change a COPY - changes are lost when function ends.
void FunctionA(int FreshInt)
{
  FreshInt = 10;
}


are different.

Let us know if you need more help.

Daniel

>From: "Thomas Stoehr" <tho...@vo...>
>To: dev...@li...
>Subject: Antwort: Re: [Dev-C++] What's the difference?
>Date: Tue, 4 Mar 2003 08:53:54 +0100
>
>this question was also very interesting for me.
>But I have one more question to the pointer story.
>What does the "&" sign mean? When do I need that sign.
>Sorry I know that is a basic question but i do not understand it int the
>book I read
>
>Thanks
>
>thomas


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