**FIRST EMAIL**/Java and Orbit Balls *****JAVA DISCUSSION***

AustinSchuh · #1 15-05-2009, 22:56

Quote:

Originally Posted by Alan Anderson

The efficiency is not what you suggest it is. Pointer arithmetic adds the result of a multiplication too: addition and subtraction are scaled by the size of the structure pointed to.

But, at least in C, the size of the structure is a known quantity at compile time, so I would imagine that most of the time that multiplication can be eliminated by the compiler. And then on top of that, sometimes the multiplication will be by a power of 2, so the compiler will use a cheap shift operation.

Alan Anderson · #2 15-05-2009, 23:46

Quote:

Originally Posted by AustinSchuh

But, at least in C, the size of the structure is a known quantity at compile time, so I would imagine that most of the time that multiplication can be eliminated by the compiler. And then on top of that, sometimes the multiplication will be by a power of 2, so the compiler will use a cheap shift operation.

This does not describe a difference between array indexing in Java and pointer arithmetic in C.

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