Increase buffer size for converting floats + doubles to String's

[sandeepmistry]

Port of arduino/ArduinoCore-samd#163

Troublesome sketch:

#include <float.h> 

void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.println(String(FLT_MAX));
  Serial.println(String(DBL_MAX));
  Serial.println(String(-FLT_MAX));
  Serial.println(String(-DBL_MAX));
}

void loop() {
}

[matthijskooijman]

What do you mean with "10" there? I can understand how -, . and \0 are added to the number of digits that FLT_MAX_10_EXP represents, but not what 10 means.

[darrylp1per]

10 as in ascii 10, being a LineFeed perhaps ?

[sandeepmistry]

On AVR DBL_MAX_10_EXP is 38 and Serial.println(String(-DBL_MAX)); prints out -340282350000000000000000000000000000000.00.

Which is 43 characters in length, then you need an extra byte for the \0, which brings us to 44.

44 - 38 - 2 = 4. Maybe, I was thinking the extra character was for the 1's digit ...

[facchinm]

Partially moved to arduino/ArduinoCore-sam#32

[ArduinoBot]

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