Can double be mathematically compared within if block?

Question

Is it safe to do mathematical calculations like if(d != 0.0), if (d < 0.005) below involving double?

#include <iostream>

int main()
{
   double d = 0.0;
   // Do some mathematical calculation.
   
   if(d != 0.0)
   {
       std::cout << "Hi";
   }

return 0;
}