Conditional using a float that is "-0" and how that works

hi,
i have float called currentdblevel varies between -100 , 0 , incremented based on input encoder. there conditionals things based on floats value 1 of them doesn't seem want , i'm not sure why. i've simplified of code show here.

code: [select]

float currentdblevel;
float max_dblevel = -0.0001;

if (currentdblevel < max_dblevel) {
      serial.print (" yes ");
      serial.print (currentdblevel);
      serial.print (" < ");
      serial.print (max_dblevel);
      serial.print (" /// ");
}

this code produces output:

code: [select]

currentdblevel: -1.00
currentdblevel: -0.00
yes -0.00 < -0.00 ///

so why currentdblevel test smaller max_dblevel? when print them same? missing something?

try:
serial.print(currentdblevel,6);

are numbers same @ 6dp? or have been rounded print function.

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