How do I add elements to an empty vector in a loop?

Question

I am trying to create an empty vector inside a loop, and want to add an element to the vector each time something is read in to that loop.

#include <iostream> #include <vector>  using namespace std;  int main() {    std::vector<float> myVector();     float x;    while(cin >> x)       myVector.insert(x);     return 0; } 

But this is giving me error messages.

Answer 1

You need to use std::vector::push_back() instead:

while(cin >> x)   myVector.push_back(x); //         ^^^^^^^^^ 

and not std::vector::insert(), which, as you can see in the link, needs an iterator to indicate the position where you want to insert the element.

Also, as what @Joel has commented, you should remove the parentheses in your vector variable's definition.

std::vector<float> myVector; 

and not

std::vector<float> myVector(); 

By doing the latter, you run into C++'s Most Vexing Parse problem.