Display Number With Leading Zeros

Display number with leading zeros

In Python 2 (and Python 3) you can do:

number = 1
print("%02d" % (number,))

Basically % is like printf or sprintf (see docs).

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For Python 3.+, the same behavior can also be achieved with format:

number = 1
print("{:02d}".format(number))

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For Python 3.6+ the same behavior can be achieved with f-strings:

number = 1
print(f"{number:02d}")

How to output numbers with leading zeros in JavaScript?

NOTE: Potentially outdated. ECMAScript 2017 includes String.prototype.padStart.

You'll have to convert the number to a string since numbers don't make sense with leading zeros. Something like this:

function pad(num, size) {
    num = num.toString();
    while (num.length < size) num = "0" + num;
    return num;
}

Or, if you know you'd never be using more than X number of zeros, this might be better. This assumes you'd never want more than 10 digits.

function pad(num, size) {
    var s = "000000000" + num;
    return s.substr(s.length-size);
}

If you care about negative numbers you'll have to strip the - and read it.

How to deal with leading zeros when formatting an int value

You can use the 0 as format specifier. From the documentation :

Replaces the zero with the corresponding digit if one is present; otherwise, zero appears in the result string.

You can do like :

02112321.ToString("00 000 000", CultureInfo.InvariantCulture)

Edit:
As indicate by @olivier-jacot-descombes, I miss a point. The OP want format a integer from a string to a string. Example "02112321" to "02 112 321".

It's possible with a intermediate conversion, string to int to string. With the example, this done "02112321" to 02112321 to "02 112 321" :

var original = "02112321";
var toInt = int.Parse(original, CultureInfo.InvariantCulture);
var formated = toInt.ToString("00 000 000", CultureInfo.InvariantCulture)

How to pad integer printing with leading zeros?

tostring[0]=(char)0; does not write the character representation of 0 into tostring[0]. It writes a zero. You want tostring[0] = '0', with single quotes. And similarly, to write the character representation of a single digit, you can write tostring[1] = '0' + hours (If hours is 5, then '0' + 5 is the character value used to represent 5 in the local character set. Thankfully, it was standardized long ago that those representations should be sequential so that sort of thing works.) But, unless the point of this exercise is to avoid using printf, you should really just use printf.

How can I format a number into a string with leading zeros?

Rather simple:

Key = i.ToString("D2");

D stands for "decimal number", 2 for the number of digits to print.

How can I pad a string with a variable number of leading zeros?

You will need to utilize a couple Expressions to handle this.

1. Declare a String variable to store the input (e.g. named InputVar). You will need to continue using the concat() Expression here with the input value to add the maximum possible zeros required for each item (e.g. 4 for BoxNo and 5 for ItemID).

   This is obviously inefficient, but there's no better way to insert a dynamic number of characters in Flow, to my knowledge.

2. Declare a second Integer variable to determine the length (e.g. named InputVarLength), with the following custom Expression as the value:

    length(variables('InputVar'))
   

3. Finally, declare a third variable that will calculate a substring result (e.g. named InputVarResult). Use this custom substring Expression as the value:

    substring(variables('InputVar'),sub(variables('InputVarLength'),5),5)
   

For the ItemID or other results, you'd replace the 5s in the substring Expression with the appropriate startIndex and length to return the size you would like. For reference, the substring format is:

substring(text, startIndex, length)

Which includes the String value you want to find a substring of, the position within that string that you want to start from, and how many characters from that starting position you want to include in your substring result.

The nested subtract format is:

sub(minuend, subtrahend)

Which includes the Integer value to be subtracted from (minuend) and the Integer value that you want to subtract (subtrahend). E.g. sub(10, 2) would return an Integer value of 8.

Variable Leading Zeros (Number Formatting)

Range("A2:A10").NumberFormat="00000"   

should do it. For more dynamic, something like:

set rng = Range("A2:A10")
rng.NumberFormat = Left("0000000000000", len(application.max(rng)))

Best way to format integer as string with leading zeros?

You can use the zfill() method to pad a string with zeros:

In [3]: str(1).zfill(2)
Out[3]: '01'

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