Behaviour of negative zero (-0.0) in comparison with positive zero (+0.0)
06:38 21 Aug 2017

In my code, 

float f = -0.0; // Negative

and compared with negative zero

f == -0.0f

result will be true.

But 

float f = 0.0; // Positive

and compared with negative zero

f == -0.0f

also, result will be true instead of false

Why in both cases result to be true?

Here is a MCVE to test it (live on coliru):

#include 

int main()
{
    float f = -0.0;

    std::cout<<"==== > " << f <

Output:

==== > -0  // Here print negative zero

true
c++ floating-point ieee-754