Initializing an array of empty vectors

Question

I'm trying to create an array of empty string vectors, but I can't manage to initialize the vectors to be able to push values into them:

vector <string> v[500];
// vector initializing code
v[0].push_back("hello"); // should work now

Error message is:

'v' does not name a type

How should I initialize so that v[0].push_back() works?

What isn't working for you at the moment? Your current problem description is unclear. EDIT: Your code works as is. Demo: here. — Algirdas Preidžius
– Algirdas Preidžius, Commented Nov 29, 2016 at 15:19
Or better, if size is known at compime-time : std::array<std::vector<string>, 500> v; — informaticienzero
– informaticienzero, Commented Nov 29, 2016 at 15:22
Also, while you're at it, remove that using namespace std;. It's a horribly bad practice. — Quentin
– Quentin, Commented Nov 29, 2016 at 15:27
@byrass is v[0].push_back("hello"); written inside a main function? — Algirdas Preidžius
– Algirdas Preidžius, Commented Nov 29, 2016 at 15:27
@byrass So, that's your problem. You cannot have executable code outside of functions. If you are having these sorts of problems, I suggest you read a book on C++. — Algirdas Preidžius
– Algirdas Preidžius, Commented Nov 29, 2016 at 15:31

Cœur · Accepted Answer · 2019-06-09 04:03:23Z

1

As pointed in all the comments on your question, your error occurs because you wrote your code out of a main function. Each C++ program must have it.

By the way, here are good practices for free (found also in comments).

Use std::array instead of C-array if you know the size at compile-time (and I believe you do).
Avoid using namespace std; because it's bad.
Be sure that you do well all your includes : #include <string>, #include <vector> and #include <array> if using-so.
If you're a C++ beginner, I suggest C++ Primer, updated for C++11. If your a complete beginner, Programming: Principles and Practice Using C++.

edited Jun 9, 2019 at 4:03

Cœur

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answered Nov 29, 2016 at 15:41

informaticienzero

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