> For the complete documentation index, see [llms.txt](https://docs.urbit.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.urbit.org/hoon/stdlib/2g.md).

# 2g: Unsigned Powers

## `+pow` <a href="#pow" id="pow"></a>

Computes `.a` raised to the power of `.b`, producing an `$atom`.

#### Accepts

`.a` is an `$atom`.

`.b` is an `$atom`.

#### Produces

An `$atom`.

#### Source

```hoon
++  pow
  ~/  %pow
  |=  [a=@ b=@]
  ?:  =(b 0)  1
  |-  ?:  =(b 1)  a
  =+  c=$(b (div b 2))
  =+  d=(mul c c)
  ?~  (dis b 1)  d  (mul d a)
```

#### Examples

```
> (pow 2 6)
64
```

```
> (pow 6 2)
36
```

```
> (pow 7 (add 2 2))
2.401
```

```
> (pow 2 0)
1
```

```
> `@ux`(pow 0x1b 2)
0x2d9
```

***

## `+sqt` <a href="#sqt" id="sqt"></a>

Computes the square root of `.a` and its remainder.

#### Accepts

`.a` is an `$atom`.

#### Produces

A cell of `$atom`s.

#### Source

```hoon
++  sqt
  ~/  %sqt
  |=  a=@  ^-  [p=@ q=@]
  ?~  a  [0 0]
  =+  [q=(div (dec (xeb a)) 2) r=0]
  =-  [-.b (sub a +.b)]
  ^=  b  |-
  =+  s=(add r (bex q))
  =+  t=(mul s s)
  ?:  =(q 0)
    ?:((lte t a) [s t] [r (mul r r)])
  ?:  (lte t a)
    $(r s, q (dec q))
  $(q (dec q))
```

#### Examples

```
> (sqt 4)
[p=2 q=0]
```

```
> (sqt 6)
[p=2 q=2]
```

```
> (sqt 2)
[p=1 q=1]
```

```
> (sqt 0b1101)
[p=3 q=4]
```

```
> `@ux`(sqt 0b1101)
! exit
```

***


---

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