Compare float with 0

Code , Running results

        if (mSetting)
            mpLocalMapper->mThFarPoints = mSetting->thFarPoints();
        else
            mpLocalMapper->mThFarPoints = fsSettings["thFarPoints"];
        // ?  Here's a question ,C++ Medium floating point followed by 0 Compare whether to use accurate ?
        if (mpLocalMapper->mThFarPoints != 0) {
    
            cout << "Discard points further than " << mpLocalMapper->mThFarPoints << " m from current camera" << endl;
            mpLocalMapper->mbFarPoints = true;
        } else{
    
            mpLocalMapper->mbFarPoints = false;
            cout << "Compare points further than " << mpLocalMapper->mThFarPoints << " m from current camera" << endl;
        }

result

Compare points further than 0 m from current camera