Best Way to Format Integer as String with Leading Zeros

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'

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 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)

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).


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

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

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

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

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.

How to format a Java string with leading zero?

In case you have to do it without the help of a library:

("00000000" + "Apple").substring("Apple".length())

(Works, as long as your String isn't longer than 8 chars.)

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NOTE: Potentially outdated.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.

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

Format string, integer with leading zeros

Use the format string "img_%03d.jpg" to get decimal numbers with three digits and leading zeros.



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