error ovf with double math arduino teensy

Question

I'm trying to count the number of digits in a double. Maybe I am going about this wrong, but I don't see what's wrong.When I have three decimals it counts correctly but at first it only displays two, so there is a difference between whats actually happening and what is being displayed. At 4 decimals I hit some large loop which ovf the numbers??? Maybe if there is a better way of counting digits, but idk how to avoid errors with double math? I just need the num digits, how doesn't matter.
My code basically just has this:

void setup() {
  Serial.begin(115200);  
  Serial.println("setup MASTER");
  Wire.begin();   
}

void loop() {
  Serial.println("");
  Serial.println("&&&&&&&&&&&&&&&master&&&&&&&&&&&&&&&&&&&&&");
  Serial.println("");
 

  Serial.println(doubleDigitCount(290));
  delay(1000);
  Serial.println("/////////////////////");
  Serial.println(doubleDigitCount(290.0));
  delay(1000);
  Serial.println("/////////////////////");
  Serial.println(doubleDigitCount(290.1));
  delay(1000);
  Serial.println("/////////////////////");
  Serial.println(doubleDigitCount(290.22));
  delay(1000);
  Serial.println("/////////////////////");
  Serial.println(doubleDigitCount(290.333));
  delay(1000);
  Serial.println("/////////////////////");
  Serial.println(doubleDigitCount(290.4444));
  delay(1000);
  Serial.println("/////////////////////");

} and then this is the function that counts digits:

int doubleDigitCount(double data){
  int count = 0;
  double whole = floor(data) + 0.0;
  double remainder = data - whole + 0.0;
  Serial.print("1data: ");   Serial.println(data + 0.0);
  Serial.print("1whole: ");  Serial.println(whole);
  Serial.print("1remainder: ");  Serial.println(remainder + 0.0);
  
  while(remainder != (double(0) + 0.0)){
    if(remainder <= .01){//the difference should always have a number in 10s decimal, and if its .011 then its larger. Too bad if the data is exactly .01 is duration = 10.01, but 
      break;
    }
    data *= 10;
    whole = floor(data) + 0.0;
    Serial.print("L data: ");Serial.println(data);
    Serial.print("L whole: ");  Serial.println(whole);
    remainder = data-whole + 0.0;
    Serial.print("diff"); Serial.println(remainder);
    count++;
  }

  return count;
}

When I run it, I get the following print outs(it's long, but ill highlight specific sections):

first half of output

second half of output

specifically, this gives ovf when i have 4 decimals. I'm guessing its an error in double math, ie .01 difference adding over 4 terms or smth

what can I do about this? Or is there another way to count digits in a double?