Read Integers over Serial

/*****************************
* Read multiple integers over serial
* James C4S / byerly0503@gmail.com / www.cmiyc.com
*
* NEWLINE *MUST* be enabled to work.
* Arduino's Serial Monitor must have NewLine enabled (lower right corner)
*
* Maximum Value of integerValue depends on its data type.
* unsigned int max is 999
* unsigned long max is 999999999
* otherwise, the number received rolls over.
*
******************************/
void setup() {
  Serial.begin(9600);
}

unsigned int integerValue=0;  // Max value is 999
char incomingByte;

void loop() {
  if (Serial.available() > 0) {   // something came across serial
    integerValue = 0;         // throw away previous integerValue
    while(1) {            // force into a loop until '\n' is received
      incomingByte = Serial.read();
      if (incomingByte == '\n') break;   // exit the while(1), we're done receiving
      if (incomingByte == -1) continue;  // if no characters are in the buffer read() returns -1

      // convert ASCII to integer, add, and shift left 1 decimal place
      integerValue = ((incomingByte - 48) + integerValue)*10;
    }
    integerValue /= 10;      // shift back right once, corrects for when '\n' is received
    Serial.println(integerValue);   // Do something with the value
  }
}