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GeekInterview.com > Interview Questions > Programming > C
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Question: Increment Operator
Answer: Explain why p++ is faster than p+1? |
| September 09, 2008 13:18:03 |
#5 |
| pirabid |
J2EE Expert Member Since: May 2008 Total Comments: 1 |
RE: Increment Operator
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This has to do with the processor, memory read cycles, and processor instructions.
All processors have separate increment/decrement instructions for increment/decrement operations. Consequently, when increment/decrement operation has to be carried out only one operand needs to be accessed and that requires 1 memory read cycle and then it goes into the CPU register and then it's incremented/decremented. But for addition operation we require two memory read cycles (because two operands are involved) and then the addition/subtraction operation is applied. This is why increment/decrement is faster than addition/subtraction.
Regards |
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