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# Idiom #76 Binary digits from an integer

Create the string s of integer x written in base 2.

E.g. 13 -> "1101"

`String s = Integer.toBinaryString(x);`
`#include <bitset>`
```std::bitset<sizeof(x)*8> y(x);
auto s = y.to_string();```
`String s = Convert.ToString(x,2);`
`String s = Convert.ToString(x,2).PadLeft(16, '0');`
`import std.conv;`
`auto s = to!string(x,2);`
`var s = x.toRadixString(2);`
`Integer.digits(x, 2) |> Enum.join("")`
`s = Integer.to_string(x, 2)`
`S = io_lib:format("~.2B~n", [X]).`
`write (unit=s,fmt='(B32)') x`
`write (unit=s,fmt='(B0)') x`
```import "fmt"
import "math/big"```
`s := fmt.Sprintf("%b", x)`
`import "strconv"`
`s := strconv.FormatInt(x, 2)`
```import Numeric (showIntAtBase)
import Data.Char (intToDigit)```
`s x = showIntAtBase 2 intToDigit x ""`
`import Data.List`
`foldl (\acc -> (++ acc) . show) "" . unfoldr (\n -> if x == 0 then Nothing else Just (x `mod` 2, x `div` 2))`
`let s = x.toString(2);`
```local s = {}

while x > 0 do
local tmp = math.fmod(x,2)
s[#s+1] = tmp
x=(x-tmp)/2
end

s=table.concat(s)```
`\$s = sprintf("%b", \$x);`
`StrUtils;`
```var
_x: Integer;
_s: String;
begin
_s := IntToBin(_x,8*SizeOf(Integer));
end.```
```var Iter,n:integer;
[...]
S := '';
for Iter := 0 to n do
s:= Char(Ord('0')+(x shr Iter) and 1) + S;   ```
`\$s = sprintf "%b", \$x;`
`s = '{:b}'.format(x)`
```s = x.to_s(2)
```
`let s = format!("{:b}", x);`

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