How to Pad Single-Digit Numbers With a Leading 0

Pad single digit numbers in column with leading zero

Use a CASE expression to check whether the column contains only 0 to 9. If true then prefix with 0 else as it is.

Query

select 
  case when col like '[0-9]' 
    then '0' + col
  else col end as newcol  
from tablename;

Pad single-digit numbers with a zero

VBA has a Format() function that you can use to pad numbers.

animal = "sinani-" & Format$(i, "00")

This will pad single-digit numbers with a 0. Your two- and three-digit numbers will continue to work as expected.

How to pad single-digit numbers with a leading 0

<?php foreach (range(1, 12) as $month): ?>
  <option value="<?= sprintf("%02d", $month) ?>"><?= sprintf("%02d", $month) ?></option>
<?php endforeach?>

You'd probably want to save the value of sprintf to a variable to avoid calling it multiple times.

How can I pad a value with leading zeros?

Since ECMAScript 2017 we have padStart:

const padded = (.1 + "").padStart(6, "0");
console.log(`-${padded}`);

How can I pad an integer with zeros on the left?

Use java.lang.String.format(String,Object...) like this:

String.format("%05d", yournumber);

for zero-padding with a length of 5. For hexadecimal output replace the d with an x as in "%05x".

The full formatting options are documented as part of java.util.Formatter.

Adding numbers with leading zeros

With str_pad:

For($i=1; $i<=44; $i++){
    Echo str_pad($i,5,"0",STR_PAD_LEFT) ."\n";
}

https://3v4l.org/Pe3M2

Str_pad(start number, length of string you want, what type of padding, where to place the padding [left/right])

Add leading zeroes to number in Java?

String.format (https://docs.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax)

In your case it will be:

String formatted = String.format("%03d", num);

0 - to pad with zeros
3 - to set width to 3