taking input from user in a vector when number of elements is variable

Question

How do we take input from user in C++ and store in vector when the number of elements is variable?

I know that when we know the number of elements we can use pretty much this code:

for(int i=0;i<n;i++)
{
   cin >> element;
   my_vector.push_back(element);
}

But in my case I don't know what the size is going to be, so how can I do this?

Does this answer your question? [How to read until EOF from cin in C++](https://stackoverflow.com/questions/201992/how-to-read-until-eof-from-cin-in-c) — smac89, Oct 06 '20 at 05:28

cigien · Answer 1 · 2020-10-06T05:32:26.183

2

You can keep looping and adding elements until the stream extraction fails:

while(cin >> element)
   my_vector.push_back(element);

The loop will terminate when there are no more elements of the appropriate type to be read from cin.

edited Oct 06 '20 at 05:32

answered Oct 06 '20 at 05:27

cigien

1 Answers1