Best way of checking if a floating point is an integer

Question

[There are a few questions on this but none of the answers are particularly definitive and several are out of date with the current C++ standard].

My research shows

Answer 1

Here is what I would try:

float originalNumber;
cin >> originalNumber;
int temp = (int) originalNumber;
if (originalNumber-temp > 0)
{
    // It is not an integer
}
else
{
    // It is an integer
}