Confirmation on C problem

[AgentEL]

I just want to confirm something with someone:

some_ptr = (char *) (void *) diff_ptr;

This line will cast diff_ptr to a void*, then to char*, right?

Weird thing to do, I know. But please humor me.

 

[BFG10K]

I believe so. If you're not sure use () to force the order you want.

 

[Barnaby W. Füi]

1 + 2 + 3

is equivelant to

1 + (2 + (3 + 4))

so your statement, I believe, would be equivelant to

some_ptr = (char *) ((void *) diff_ptr);

so yeah, it should do what you want.

 

[arcain]

Originally posted by: BingBongWongFooey
1 + 2 + 3

is equivelant to

1 + (2 + (3 + 4))

so your statement, I believe, would be equivelant to

some_ptr = (char *) ((void *) diff_ptr);

so yeah, it should do what you want.

That is a poor example. Though equivalent in a mathematical sense, the addition (+) operator is left associative.
So 1 + 2 + 3 + 4 (I assume you intended to put a 4 there) is really (((1+2) + 3) + 4).

A C style cast is right associative, and your last statement is correct.

 

[Barnaby W. Füi]

I thought all of the operators worked left to right. Or right to left.. or whatever. I was thinking of << and figured that + was the same. And yeah, I meant to have a 4 there.

 

[Replicon]

Sorry but i have to ask, out of curiosity - what ARE you doing that requires that cast? Is it just a homework question?