Arguments in function

Heres some objects I have setup in SDL:

Code:

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SDL_Surface* screen;
SDL_Surface* tiles;
SDL_Rect src, dest;

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Heres an example of passing these into a function:

Code:

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SDL_BlitSurface(tiles , &src , screen , &dest);

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I want to write a function that accepts these arguments, but I'm not sure how to write it.
As you can see I don't know what to put for the parameters 'src' and 'dest':

Code:

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DoSomething(SDL_Surface *tiles, src, SDL_Surface *screen, dest)

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Could someone quickly tell me how I should do this? Thanks.

Looks like SDL_Rect *src and SDL_Rect *dest to me...

Yeah, thats what I tried at first but it would not work at the time. I just realized that I declared these:

Code:

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SDL_Surface* screen;
SDL_Surface* tiles;
SDL_Rect src, dest;

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As globals, so I don't even have to pass them in. Maybe that was what caused the problem in the first place. I don't know.

If they're declared as pointers, then you would need &dst and &src