How to Pad a String With Zeroes

Left padding a String with Zeros

If your string contains numbers only, you can make it an integer and then do padding:

String.format("%010d", Integer.parseInt(mystring));

If not I would like to know how it can be done.

How do I pad a string with zeroes?

To pad strings:

>>> n = '4'
>>> print(n.zfill(3))
004

To pad numbers:

>>> n = 4
>>> print(f'{n:03}') # Preferred method, python >= 3.6
004
>>> print('%03d' % n)
004
>>> print(format(n, '03')) # python >= 2.6
004
>>> print('{0:03d}'.format(n))  # python >= 2.6 + python 3
004
>>> print('{foo:03d}'.format(foo=n))  # python >= 2.6 + python 3
004
>>> print('{:03d}'.format(n))  # python >= 2.7 + python3
004

String formatting documentation.

How to pad a numeric string with zeros to the right in Python?

See Format Specification Mini-Language:

In [1]: '{:<08d}'.format(190)
Out[1]: '19000000'

In [2]: '{:>08d}'.format(190)
Out[2]: '00000190'

Add zero padding to string in c?

You need to use sprintf

sprintf(file_frame, "%04d", 34);

The 0 indicates what you are padding with and the 4 shows the length of the integer number.

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Also you should be using mutable array as below.

char *file_frame = "shots"; --> char file_frame[100] = "shots";

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.

What is the easiest way to pad a string with 0 to the left?

The fmt module documentation describes all the formatting options:

Fill / Alignment

The fill character is provided normally in conjunction with the
width parameter. This indicates that if the value being formatted is
smaller than width some extra characters will be printed around it.
The extra characters are specified by fill, and the alignment can be
one of the following options:

• < - the argument is left-aligned in width columns
• ^ - the argument is center-aligned in width columns
• > - the argument is right-aligned in width columns

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assert_eq!("00000110", format!("{:0>8}", "110"));
//                                |||
//                                ||+-- width
//                                |+--- align
//                                +---- fill

See also:

• How can I 0-pad a number by a variable amount when formatting with std::fmt?
• How do I print an integer in binary with leading zeros?
• Hexadecimal formating with padded zeroes
• Convert binary string to hex string with leading zeroes in Rust

How to pad strings with zeros in Ruby

There is a zero-padding function for Strings in Ruby:

puts acct.rjust(23, '0')

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