SDL_Rect last array not being set?

Engines and Middleware Programming

Started by MrPickle February 25, 2008 01:02 PM

1 comment, last by MrPickle 16 years, 2 months ago

MrPickle

118

Author

February 25, 2008 01:02 PM

I declare this as a global

SDL_Rect playerDown[2];

then I set the variables like

    playerDown[0].x = 6;
    playerDown[0].y = 1;
    playerDown[0].w = 17;
    playerDown[0].h = 26;
    
    playerDown[1].x = 41;
    playerDown[1].y = 1;
    playerDown[1].w = 17;
    playerDown[1].h = 26;
    
    playerDown[2].x = 76;
    playerDown[2].y = 1;
    playerDown[2].w = 17;
    playerDown[2].h = 26;

but it doesn't set playerDown[2], but the compiler doesn't complain that I'm trying to set it? If I make SDL_Rect playerDown[2], SDL_Rect playerDown[3] playerDown[2] then works but playerDown[3] doesn't, can anyone explain this please?

Here to learn :)

rip-off

11,000

February 25, 2008 01:29 PM

The array "SDL_Rect playerDown[2];" has two elements, indexable by 0 and 1.

Thus, there is no playerDown[2] rect, and accessing it is undefined behaviour (typically this will manifest itself as another, often unrelated, variable suddenly changing its value, or a segfault, but you cannot rely on this). If you want three elements, use "SDL_Rect playerDown[3];"

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MrPickle

118

Author

February 25, 2008 01:44 PM

Yeah, I figured out what was wrong after like a hour and I was like "WTF, why isn't playerDown[2] being set"

Thanks.

Here to learn :)