How to get the element in Vector using the specified position in c++?

Question

如何通过在矢量模板中提供位置来获取元素？

Answer 1

You access std::vector elements just like a regular C array:

std::vector<int> myVector;

//(...)


int a = myVector[1];

Answer 2

You could use the 'at' function (someVector.at(somePosition) gets you the element at somePosition), or you could use someVector[somePosition]. It's like a more developed array.

The difference between using the at function is that it will throw an exception if you give it an invalid position, while the []s don't check for things like that.

Answer 3

There are 2 ways to accomplish what you want (for a vector say Vec):

  (1) Use at() function eg. Vec.at(index)

  (2) Use like a normal array eg. Vec[index]

Answer 4

Indexing works on Vectors, So just Acces it by using index. Similar to arrays.