Serial Monitor prints extra 2 lines

Using Arduino Programming Questions
1

Hello,

This the sketch:

<
int number;

void setup() {
Serial.begin(9600);
}

void loop()
{
number=0;
Serial.flush();
while(Serial.available()==0)
{
//do nothing
}
while(Serial.available()>0)
{
number=Serial.read()-'0';
}
Serial.print("You entered: ");
Serial.println(number);
Serial.print(number);
Serial.print(" multiplied by two is ");
number=number*2;
Serial.println(number);
}

The sketch asks to enter an integer in the Serial Monitor and it responds with this:

You entered: 5
5 multiplied by two is 10
You entered: -38
-38 multiplied by two is -76

Why there seems to be a second entry (hanging in the buffer?)? I attempted multiple fixes (not that I have a lot of them in my sleeves) and nothing worked.

I appreciate any suggestions.
Thanks

2

Change the line ending control on the serial monitor to "none", or handle the line ending yourself.

Please remember to use code tags when posting code.

3

there seems to be a second entry (hanging in the buffer?)?

Lokos like you have got the Serial monitor Line ending set to linefeed, hence the value of 10 being returned. Try setting it to No line ending

4

AWOL and UKHeliBob, you both were right. Thank you very much for your lightning-fast response.
Now I am un-stuck and can go forward with my quest to learn.

5

Sorry, I didn't know how to use the code tags, now I know. :o Will use them the next time.