How to center a string-Programing a Christmas Tree

Using Arduino Programming Questions
#1

Hi, I'm taking my first steps programing in Arduino and I would want to know if there's any function to program the posición of the text that prints in the console.
Basically I have to "draw" a Christmas Tree with "*". I already programed half of the tree and it was prety easy but I dont know how to center strings or even if its posible. Does anyone have an idea of how can I do it?

Here I post graphic examples of what I did and what I want to achieve in case I haven't explained well.
This is the half tree I already did:
*
**

And this is what I want to do now:
*

Any suggestion would be appreciated. Thanks!!

#2

I already programed half of the tree and it was prety easy

Please post the code that you have so far

#3

You first need to know the width of the bottommost row.

#4

Hi,
Welcome to the forum.

Please read the post at the start of any forum , entitled "How to use this Forum".
OR
http://forum.arduino.cc/index.php/topic,148850.0.html.
Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Thanks.. Tom... :slight_smile:

#5

spicyshark:
Hi, I’m taking my first steps programing in Arduino and I would want to know if there’s any function to program the posición of the text that prints in the console.
Basically I have to “draw” a Christmas Tree with “*”. I already programed half of the tree and it was prety easy but I dont know how to center strings or even if its posible. Does anyone have an idea of how can I do it?

Here I post graphic examples of what I did and what I want to achieve in case I haven’t explained well.
This is the half tree I already did:
*
**

And this is what I want to do now:
*

Any suggestion would be appreciated. Thanks!!

Something like this maybe…

void setup() {

  Serial.begin(115200);

  int total_stars = 9; // maximum number of stars in string (must be odd)
  int star_pos = total_stars / 2; //initialise to middle of string

  char star_str[total_stars + 1]; //declare string array. +1 to add null terminator

  memset (star_str, ' ', total_stars); //initialise array to with <space>
  star_str[total_stars] = '\0'; //add null terminator

  //build christmas tree
  for (int i = 0; i < total_stars; ++i) {
    if (i % 2 == 0) {
      star_str[star_pos] = '*';
      star_str[star_pos + i] = '*';
      --star_pos;
      Serial.print(star_str); //print out char string
    }
    Serial.print("\n");
  }

}

void loop() {

}

Output:

    *

   ***

  *****

 *******

*********

hope the helps…

#6

Why complicate things ?

void setup()
{
  Serial.begin(115200);
  Serial.println("    *\n   ***\n  *****\n *******\n*********");
}

void loop()
{
}

However, I assume that the OP has not given us the full story of what he/she is trying to achieve

#7

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