C type casts and addition precedence

What's the precedence in the next expression?

item = (char*)heap + offset;

Is it (char*)(heap + offset) or ((char*)heap) + offset?

Cast trumps binary addition according to the precedence table.

It's ((char *)heap) + offset. Casts have much higher precedence than addition.

((char*)heap) + offset

The cast is done first, since it has a much higher precedence.

You can look that up in the C precedence table: