Learning C

[desiv]

Originally Posted by Leffmann

Ok I see you're actually calling GCC.

Well, I don't totally understand what is calling what myself.. ;-)

But that worked!!!
(Much smaller Amiga executable too.. The original was 15k, the 1.3 version is 3.8k. ;-)

Thanx!

desiv

[ReadOnlyCat]

Originally Posted by desiv

Well, I don't totally understand what is calling what myself.. ;-)

But that worked!!!
(Much smaller Amiga executable too.. The original was 15k, the 1.3 version is 3.8k. ;-)

desiv

When you call

m68k-amigaos-gcc

that's gcc. However the

vb<something>

utilities are part of the vbcc compiler (available at http://sun.hasenbraten.de/vbcc/).

[desiv]

Moving forward...
I just did the basic open window example from "Amiga C for Beginners" (which I own again, and was the book I had back in the day.
I was able to compile it and get a window to pop up!!

I did have 1 line it didn't like:
if ((Window = OpenWindow(&NewWindow)) == NULL)
exit (FALSE);

I had to change it to:
if ((Window = (struct Window *) OpenWindow(&NewWindow)) == NULL)
exit (FALSE);

Even tho I did have:
struct Window *Window;
..near the top..

vbcc was giving me a:
> if ((Window = OpenWindow(&NewWindow)) == NULL)
error 39 in line 43 of "window.c": invalid types for assignment

Luckily, a quick google found the change...

So.. Making progress, but of course, looks like there will be differences (as expected).

I used DICE back in the day, and the book seems to expect you to use Aztec C (or Lattice).

Thanx again...

desiv

[ReadOnlyCat]

Originally Posted by desiv

Moving forward...
I just did the basic open window example from "Amiga C for Beginners" (which I own again, and was the book I had back in the day.
I was able to compile it and get a window to pop up!!

Congratulations!

Originally Posted by desiv

I did have 1 line it didn't like:
if ((Window = OpenWindow(&NewWindow)) == NULL)
exit (FALSE);

I had to change it to:
if ((Window = (struct Window *) OpenWindow(&NewWindow)) == NULL)
exit (FALSE);

Even tho I did have:
struct Window *Window;
..near the top..

vbcc was giving me a:
> if ((Window = OpenWindow(&NewWindow)) == NULL)
error 39 in line 43 of "window.c": invalid types for assignment

Luckily, a quick google found the change...

desiv

It's probably because the function

OpenWindow

is not declared as returning a

struct Window*

but rather a

void *

. Which headers do you include?

It is a bit weird that you had to cast that return value.

This said, all compilers should behave the same with this code since it is 100% standard from what I can read.

[desiv]

Originally Posted by ReadOnlyCat

This said, all compilers should behave the same with this code since it is 100% standard from what I can read.

You're right.
I had a typo in my extern struct.. (And I even had my glasses on.. Oh well. )

Fixed that and removed the specific struct and it works..
It does warn me when I compile:
me@mymachine ~/Retro/Amiga/DEV $ vc -o window window.c
> if ((Window = OpenWindow(&NewWindow)) == NULL)
warning 85 in line 43 of "window.c": assignment of different pointers

But it compiles and runs fine...
(I'll check for more typos later.. ;-)

desiv

[nobody]

A simple countdown timer i did.
main() or other function is calling timer and pass an argument like timer(500);


int timer (int time)
{
if (time>=0)
{
printf("time %d\n",time);
time--;
Delay(50L); /*delay 50 frames (1sec) or 60L for NTSC*/
}
else
gameover(); /*another function for game over sequence*/
}

[Zetr0]

A big thanks for ReadOnlyCat putting me onto these threads.

For those that want to learn a bit more C/C++ there is w3schools.net as well as google - I would also humbly suggest having a look at nehe (http://nehe.gamedev.net/) to take their knowledge to the next level.

For Windows on the Amiga I would humbly suggest people look at GadTools - its a great program and gives you a WYSIWYG environment to create Screen / Window(s) and then provides the code / handlers you need - http://aminet.net/package/dev/misc/gt34_1


I am currently looking for a dev environment (playing with Hannibal's Dev Tool Chain) - as I want to try and port games / applications over to the Amiga (SDL etc) - its been well over 10 years since I hit C/C++ on the Amiga in any serious way - (used to use DICE - lots of Make File Mayhem!


I hope that helps =)

[Daedalus]

Originally Posted by Zetr0

For those that want to learn a bit more C/C++ there is w3schools.net as well as google

I was curious as to whether W3Schools had started doing C code as well as web stuff, and also to see if it was the same site as w3schools.com, so I went to w3schools.net...

Erm, well let's just say it's less about computer programming and more about human programming... Seems to be some sort of religious nut website with a look of '90s Geocities HTML about it. An interesting page I'm sure if religion or '90s web design are your bag, but not a whole lot of C

[Zetr0]

@Daedalus

Its been a few years since I was on there - I remember using it a lot for my HND - which would of been errr... 9 ish years ago?

And that was not the correct link LMFAO! - http://www.w3schools.com/ - there you go!


Interestingly there is no "C/C++" on there any more - just web based languages =(