Serial.print(0ULL) gives empty output

[warmonkey]

Test case:
Serial.print(0ULL);
Expected output: 0
Actual output: nothing

Quick fix:

// FAST IMPLEMENTATION FOR ULL
size_t Print::printULLNumber(unsigned long long n64, uint8_t base)
{
  //handle special case
  if (n64 == 0) {
    write('0');
    return 1;
  }

[aentinger]

Can you create a PR or at least a failing test case?

[earlephilhower]

Failing example from earlephilhower/arduino-pico#1691

void setup() {
  Serial.begin(9600);
  while (!Serial) {}
  uint64_t n = 123;
  uint64_t m = n;
  Serial.print("n - m = ");
  Serial.println(n - m);
  n++;
  Serial.print("n - m = ");
  Serial.println(n - m);
}
void loop() {}

Gives

n - m =
n - m = 1