String print LCD integer

[etrigo]

Hi, I need some help with my Arduino.
I wanted to create a string with a length of 3 characters.
and wanted to print this string on the LCD display.
these 3 characters will be an integer that can range between 0 and 999.

int number = 123 // range between 0 and 999
string a = number;  // the string must always be 3 characters long.
lcd.print(a);

My problem is how do I define the string with only 3 characters of space? that is, even if the number only has 1 character I want the string to have 3. That is, when printing it would be ("clear","clear",3)

[anon73444976]

You could use dtostrf, but that doesn't work with Strings

[noiasca]

may be you just want something like

int number = 123;
if (number < 100) lcd.print(" ");
if (number < 10) lcd.print(" ");
lcd.print(number);

in plain text: just add blanks if you need them.

[bradley2020]

Try running this:

    char myNumberToPrint[4] = ""; //has to have size of 4 to include '\0';

    for(int theNumber = 0;theNumber<15;theNumber++){
        snprintf(myNumberToPrint, sizeof(myNumberToPrint), "%d  ", theNumber);
        lcd.print(myNumberToPrint);
        delay(100);
    }

by using snprintf(), you can add two spaces after the %d and then these will be added if the strlength of the integer is too low. So if theNumber = 9, the lcd will print 9 with two spaces, but if theNumber = 123, the ldc will print 123 with no spaces.

This works because snprintf() will make sure that whatever "%d " is, it will only ever copy the first 3 characters to ensure the final char in myNumberToPrint is a '\0'

[bradley2020]

Sorry i've just seen that you want it in the format of:
" 1", " 10", "231"
i.e. white spaces before the number.

In order to do that, use the code in my previous reply and change the snprintf() line from:
snprintf(myNumberToPrint, sizeof(myNumberToPrint), "%d ", theNumber);
to
snprintf(myNumberToPrint, sizeof(myNumberToPrint), "%3d", theNumber);
and you will get it in the format you like

[etrigo]

it will probably work but i have a problem if you can help me.
the value of the number comes from an integer. how do i convert this integer?

int number = 123;
char myNumberToPrint[4] = number;

[bradley2020]

int number = 123;
char myNumberToPrint[4] = "";

snprintf(myNumberToPrint, sizeof(myNumberToPrint), "%3d", number);

[etrigo]

sorry my distraction