Am Freitag, 5. Dezember 2008 schrieb 孙宗君:
> Why the following code is illegal?
>
>
> #include <iostream>
> #include <vector>
>
> vector<int > vi;
>
> vi.push_back(10); //why this line is illegal?
> int ii = vi.at(0); // this line is legal??
>
> int main()
> {
> return 0;
> }
>
You want this:
</code>
#include <vector>
vector<int> vi;
int main()
{
vi.push_back(10);
int ii = vi.at(0);
return 0;
}
</code>
or even better
<code>
#include <vector>
int main()
{
vector<int> vi;
vi.push_back(10);
int ii = vi.at(0);
return 0;
}
</code>
because one should avoid global variables.
As Ian mentioned this is a basic C++ language question. The best place to ask
these kind of questions is the c++ news group:
http://groups.google.de/group/comp.lang.c++/topics
Please use the search service you'll see there before asking a question.
To make you life much easier, the first things you should search for are a
nice c++ tutorial at the web and a good C++ beginner book.
Best,
-- Maik
