Re: [algogeeks] Pre/Post L and r value
Yes, you are right. Pre increment simply increments and returns
*reference*to same object.
somewhat like:
int& operator++(int &n){
n = n+1;
return n;
}
On 31 October 2012 02:08, rahul sharma wrote:
> @saurabh..thnxplz provide me code snippet for pre increment also..it
> will help a lot..i can guess it will do n++ and return itself..plz give
> code snippet...
>
>
> On Mon, Oct 29, 2012 at 10:50 AM, Saurabh Kumar wrote:
>
>> Post increment returns temp object because it has to return the old value
>> of object not the new incremented one:
>> Simply put, the code for post increment somewhat goes like this:
>>
>> int operator++ (int &n){
>> int temp = n;
>> n = n+1;
>> return temp;
>> }
>>
>> that's also the reason you cannot use it as a lvalue in an exprression,
>> as you would be assigning nowhere.
>>
>> On 27 October 2012 20:09, rahul sharma wrote:
>>
>>> But y post returns temp. object
>>>
>>>
>>> On Fri, Oct 26, 2012 at 8:18 PM, Saurabh Kumar wrote:
>>>
i++: Post increment can't be a lvalue because Post increment internally
returns a temporary object (NOT the location of i) hence you cannot assign
anything to it. The result of i++ can be used only as a rvalue.
++i: whereas, in Pre-increment value gets incremented and the same
location is returned back to you, hence can be used as lvalue in an
expression.(C++ allows this)
Both can be used as rvalues though.
On 26 October 2012 18:54, rahul sharma wrote:
> why pre inc. is l value and post is r value..please explain
>
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Re: [algogeeks] Pre/Post L and r value
@saurabh..thnxplz provide me code snippet for pre increment also..it
will help a lot..i can guess it will do n++ and return itself..plz give
code snippet...
On Mon, Oct 29, 2012 at 10:50 AM, Saurabh Kumar wrote:
> Post increment returns temp object because it has to return the old value
> of object not the new incremented one:
> Simply put, the code for post increment somewhat goes like this:
>
> int operator++ (int &n){
> int temp = n;
> n = n+1;
> return temp;
> }
>
> that's also the reason you cannot use it as a lvalue in an exprression, as
> you would be assigning nowhere.
>
> On 27 October 2012 20:09, rahul sharma wrote:
>
>> But y post returns temp. object
>>
>>
>> On Fri, Oct 26, 2012 at 8:18 PM, Saurabh Kumar wrote:
>>
>>> i++: Post increment can't be a lvalue because Post increment internally
>>> returns a temporary object (NOT the location of i) hence you cannot assign
>>> anything to it. The result of i++ can be used only as a rvalue.
>>> ++i: whereas, in Pre-increment value gets incremented and the same
>>> location is returned back to you, hence can be used as lvalue in an
>>> expression.(C++ allows this)
>>> Both can be used as rvalues though.
>>>
>>> On 26 October 2012 18:54, rahul sharma wrote:
>>>
why pre inc. is l value and post is r value..please explain
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>>>
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>>
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>
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Re: [algogeeks] Pre/Post L and r value
Post increment returns temp object because it has to return the old value
of object not the new incremented one:
Simply put, the code for post increment somewhat goes like this:
int operator++ (int &n){
int temp = n;
n = n+1;
return temp;
}
that's also the reason you cannot use it as a lvalue in an exprression, as
you would be assigning nowhere.
On 27 October 2012 20:09, rahul sharma wrote:
> But y post returns temp. object
>
>
> On Fri, Oct 26, 2012 at 8:18 PM, Saurabh Kumar wrote:
>
>> i++: Post increment can't be a lvalue because Post increment internally
>> returns a temporary object (NOT the location of i) hence you cannot assign
>> anything to it. The result of i++ can be used only as a rvalue.
>> ++i: whereas, in Pre-increment value gets incremented and the same
>> location is returned back to you, hence can be used as lvalue in an
>> expression.(C++ allows this)
>> Both can be used as rvalues though.
>>
>> On 26 October 2012 18:54, rahul sharma wrote:
>>
>>> why pre inc. is l value and post is r value..please explain
>>>
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>>
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>>
>
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Re: [algogeeks] Pre/Post L and r value
But y post returns temp. object On Fri, Oct 26, 2012 at 8:18 PM, Saurabh Kumar wrote: > i++: Post increment can't be a lvalue because Post increment internally > returns a temporary object (NOT the location of i) hence you cannot assign > anything to it. The result of i++ can be used only as a rvalue. > ++i: whereas, in Pre-increment value gets incremented and the same > location is returned back to you, hence can be used as lvalue in an > expression.(C++ allows this) > Both can be used as rvalues though. > > On 26 October 2012 18:54, rahul sharma wrote: > >> why pre inc. is l value and post is r value..please explain >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To post to this group, send email to algogeeks@googlegroups.com. >> To unsubscribe from this group, send email to >> algogeeks+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/algogeeks?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] Pre/Post L and r value
i++: Post increment can't be a lvalue because Post increment internally returns a temporary object (NOT the location of i) hence you cannot assign anything to it. The result of i++ can be used only as a rvalue. ++i: whereas, in Pre-increment value gets incremented and the same location is returned back to you, hence can be used as lvalue in an expression.(C++ allows this) Both can be used as rvalues though. On 26 October 2012 18:54, rahul sharma wrote: > why pre inc. is l value and post is r value..please explain > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
[algogeeks] Pre/Post L and r value
why pre inc. is l value and post is r value..please explain -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
