How to convert vector iterator to int in C++

Question

I am looking for an element in a C++ vector, and when I find it, I want to get found element\'s index in a numerical form(integer, float).

My naive attempt is this :

Answer 1

You just dereference the iterator like this

index = *it;

However you should first see if you actually found something

it = find(myvector.begin(), myvector.end(), x);  
if (it != myvector.end())
{
    index = *it;
}

To find the index in that the match was found, you can use subtraction of the found pointer from the start of the vector.

it = find(myvector.begin(), myvector.end(), x);  
if (it != myvector.end())
{
    index = it - myvector.begin();  // Index from start of vector
}

Also, hopefully in your actual code you defined x, as in the snippet you showed x is uninitialized so this will result in undefined behavior.