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cast?

Does anybody know, how one have to cast an operation correctly? And is it necessary to tell the compiler that a constant is unsined long

#define dword unsigned long
unsigned char ucH;    //hours
unsigned char ucM;    //minutes
unsigned char ucS;    //seconds
dword ulTime;         //Time in s

GetTime(...);
ulTime = ucS + ucM*60 + ucH*3600;
[..]
this won't work! How do I have to cast the calculation?

ulTime = (dword)(ucS + ucM*60 + ucH*3600);
or
ulTime = ucS + (dword)ucM*60 + (dword)ucH*3600);
or ???

I have tried to find any written description (K&R, C166-Reference) but I could't find anything about this theme!

Do I have to use 3600 or 3600ul?

Thank you
...Leo

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