C - Increment Operator

GeekInterview.com > Interview Questions > Programming > C

Go To First | Previous Question | Next Question

C | Question 417 of 453

Increment Operator

Explain why p++ is faster than p+1?

Total Answers and Comments: 5

Last Update: September 20, 2008 Asked by: amar_keerthi07

Sponsored Links

Best Rated Answer

—

Submitted by: kaivalya1989

p++ is a unary operator that is why it is fast
as it operates on only one operand
on the other hand p+1
+ is a binary operator that is why it is slower as compared to ++

Above answer was rated as good by the following members:
vhps.18

June 04, 2008 01:30:58

chandrakala Kempapura

Member Since: June 2008 Contribution: 3

RE: Increment Operator

Hi Amar
Increament opetaotrs is an unary operator. which operate on single operand.
But + ia an binary operator needs at least 2 oprands to execute.

so always unary operators are faster than binary operators.

Regards
chandrakala

Is this answer useful? Yes | No

June 30, 2008 07:26:54

hiralbest

Member Since: June 2008 Contribution: 1

RE: Increment Operator

p++ is a macro and inbuit function.and the + is binary operator.
so p++ is faster than p+1.

Is this answer useful? Yes | No

1 0

Overall Rating: +1

July 12, 2008 04:45:34

kaivalya1989

Member Since: May 2008 Contribution: 5

RE: Increment Operator

p++ is a unary operator that is why it is fast
as it operates on only one operand
on the other hand p+1
+ is a binary operator that is why it is slower as compared to ++

Is this answer useful? Yes | No

1 0

Overall Rating: +1

July 12, 2008 04:52:48

kaivalya1989

Member Since: May 2008 Contribution: 5

RE: Increment Operator

static memory allocation :
the memory allocation is done at the time of compilation itself..
it is known as static because this allocation cannot be changed is less memory or more memory is needed at the time of execution of program...
in this type good memory management is not achieved as many times memory loss takes place or shortage of memory rakes place....
dynamic memory allocation:
the memory allocation is done at the run time of program...
as per needed... thus good memory management is achieved
this is done by using some inbuilt functions
malloc() calloc() realloc() free() etc
for using these functions we need to include alloc.h........

Is this answer useful? Yes | No

September 19, 2008 13:18:03

pirabid

Member Since: May 2008 Contribution: 1

RE: Increment Operator

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

Is this answer useful? Yes | No

Go To Top

User Name		Remember Me?
Password

Question Bank