Re: [avr-gcc-list] Cpp Question

[Joerg Wunsch]

As "=?ISO-8859-2?Q?Matja=BE_Jane=BEi=E8?="
<address@hidden> wrote:

>I'm trying to program a function which returns values as parameters:
>
>void foo(int a, int b, float c)
>{
>b++;
>c=sqrt(a+b)
>}
>
>but it does't work

Sure.  If you want to program in C, well, you gotta learn
it.  This is basically a C beginner's questin, unrelated
to the AVR.

Basically, you need to calculate the address yourself.

void foo(int a, int *b, float *c)
{
 (*b)++;
 *c = sqrt(a + *b)
}

And you have to call it with

 foo(a, &b, &c);

C++ has the concept of reference parameters which is closer to the
Pascal var parameters.

-- 
J"org Wunsch                                           Unix support engineer
address@hidden        http://www.interface-systems.de/~j/