Arduino Blocks at Uploading

Question

I am trying to make an operating hours counter with arduino, i started with a basic script to make the arduino work as a stop watch, This is my script:

unsigned long start=0, finish=0, elapsed=0;

 void setup() {
 Serial.begin(9600);
 Serial.println("Clock START");
 }
 void displayResult(unsigned long elapsed){
   float h,m,s,ms;
   unsigned long over;
   h=int(elapsed/3600000);
   over=elapsed%3600000;
   m=int(over/60000);
   over=over%60000;
   s=int(over/1000);
   ms=over%1000;
   Serial.print("Elapsed time: ");
   Serial.print(h,0);
   Serial.print("h ");
   Serial.print(m,0);
   Serial.print("m ");
   Serial.print(s,0);
   Serial.print("s ");
   Serial.print(ms,0);
   Serial.println("ms");
   Serial.println();
 }

 void loop() {
   start = millis();
   delay(200);
   Serial.println("Start");
   Serial.println("doing Operations and stuff");
   delay(800);
   finish=millis();
   elapsed=finish-start;
   Serial.println("Ended !!!");
   displayResult(elapsed);

 }

Unfortuantly the arduino compiler blocks at the Uploading part, i tried compiling it at first without uploading, it gave me no warning errors. I tried compiling other scripts they worked, it only blocks for this stop watch code.
Thank you for your help

Answer 1

There is a bug in early versions of the Mega2560 bootloader. It crashes on !!! (or enters some other special state that stops uploading happening).

Your string that contains !!! will be breaking it:

Serial.println("Ended !!!");

Simple solution: don't use so many exclamation marks.