C type casts and addition precedence

What's the precedence in the next expression?

item = (char*)heap + offset;

开发者_高级运维

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

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Cast trumps binary addition according to the precedence table.

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

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((char*)heap) + offset

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

You can look that up in the C precedence table: