decentswati

 Profile Answers by decentswati 

• Jul 21st, 2008

 

++p is faster as the implementation of p++ will have extra execution cycles for returning the previous memory location reference in addition to the incrementing of value.

Jaya_Kaja

 Profile Answers by Jaya_Kaja 

• Jul 28th, 2008

 

Between ++p & p++ , there is no diff in terms of speed of execution .because both are of unary . But there is a diff in the evaluation of an expression by using these unary operations.

++p - First the value of p gets incremented by one & then the incremented value will be used in the expression for further evaluation.
p++ - First the value of p is used in the expression & then the value of p will get incremented by one .

For eg :

a) p= 10;

val = ++p * 100 ;
Here val = 1100;
p = 11;

b) p=10;
val = p++ * 100;
Here val = 1000;
p =11;

- Jayalakshmi Kaja

sandyseaweed

 Profile Answers by sandyseaweed 

• Nov 7th, 2008

 

speed is the same. 

int iSpeedTest = i++;

00413773  mov         eax,dword ptr [ebp-0Ch] 

00413776  mov         dword ptr [ebp-150h],eax 

0041377C  mov         ecx,dword ptr [ebp-0Ch] 

0041377F  add         ecx,1 

00413782  mov         dword ptr [ebp-0Ch],ecx 

iSpeedTest = ++i;

00413785  mov         eax,dword ptr [ebp-0Ch] 

00413788  add         eax,1 

0041378B  mov         dword ptr [ebp-0Ch],eax 

0041378E  mov         ecx,dword ptr [ebp-0Ch] 

00413791  mov         dword ptr [ebp-150h],ecx 

kbjarnason

 Profile Answers by kbjarnason 

• Jul 1st, 2010

 

The correct answer is that the language does not define the performance of such operations; how they are implemented, how they are optimized and whether one is faster than the other are implementation-specific details, which may very well change, even radically, from one implementation to the next.