using the elements of a vector

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UPDATED:
sorry,i think my question wasnt clear enough so i updated my question to this:

i have a vector and it has 5 elements

now how can i use for example second element of it,i mean in array we can use it by [] for example : myarray[1] but in vector i cant use [],what should i do?
thanks in advance

Posted 27-Jul-11 4:46am

arashmobileboy

Updated 27-Jul-11 21:23pm

v4

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3 solutions

Solution 1

Use std::list or std:vector ( a vector is an array ). The standard template library is a subject best covered in articles, not forum replies.

STL 101 Part A - Vector[^]

Posted 27-Jul-11 4:50am

Christian Graus

Solution 2

If you're using this within a for() loop, then odds are you do know the size. Remember that you should only use a dynamic container when you need it, otherwise it will tend to make your program quite a bit slower (depending on which container you choose, the amount will vary) since dynamic memory allocations are quite costly in time.

Posted 27-Jul-11 5:16am

Albert Holguin

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arashmobileboy 27-Jul-11 11:32am

you said correct,my example isnt completely correct,its just a simple example,please see my updated question and say me is it correct or not,thanks so much

Albert Holguin 27-Jul-11 14:11pm

Somewhat, the concept is correct, but you have to use an iterator to get the values stored and your evaluation order of the math wouldn't give you the results you expect. If you're ever not sure of evaluation order of math, its best to use parentheses.

Here's a reference for std::list with examples:
http://en.wikipedia.org/wiki/List_%28C%2B%2B%29[^]

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PrafullaVedante · Accepted Answer · 2011-07-27T22:06:00

Solution 3

Use "at" function of of vector class

Posted 27-Jul-11 22:06pm

PrafullaVedante

Comments

arashmobileboy 28-Jul-11 4:16am

solved,thanks so much