# Fourier

Fourier is a golfing language created by Stack Exchange user Beta Decay, with similarities to Brainfuck, but more advanced. It is still undergoing development as of August 2015.

## Syntax

### Repeat

`()`

Repeat the code within the brackets until the accumulator equals the value of the accumulator before the brackets. After the open bracket, the accumulator is set to 0. Repeats can be nested.

### If

`{a}{b}`

If the result of `a` equals the value of the accumulator, then run code `b`. After the open curly bracket, the accumulator is set to 0. Ifs cannot be nested.

### Increase

`^`

Increase the accumulator by one.

### Decrease

`v`

Decrease the accumulator by one.

### Number

`n`

Set the accumulator to the integer `n`.

### Character out

`a`

Takes the value of the accumulator as the ASCII code and outputs the character.

### Number out

`o`

Outputs the value of the accumulator.

### Random

`r`

Sets the accumulator to a random value in the range 0 to the value of the accumulator.

### Set variable

`~z`

Creates a variable `z` and sets it to value of the accumulator.

### Call variable

`z`

Sets the accumulator to the value of variable `z`. If not previously initialised, the variable is equal to 0.

`+x`

Sets the accumulator to the value of the accumulator plus the value of `x`.

### Subtract

`-x`

Sets the accumulator to the value of the accumulator minus the value of `x`.

### Multiply

`*x`

Sets the accumulator to the value of the accumulator multiplied by the value of `x`.

### Divide

`/x`

Sets the accumulator to the value of the accumulator divided by the value of `x`.

### Modulo

`%x`

Sets the accumulator to the remainder of the value of the accumulator divided by the value of `x`.

### Input

`I`

Sets the accumulator to the user input.

### Greater than

`>x`

Sets the accumulator to 1 if the value of the accumulator is greater than the value of `x`, 0 if not.

### Less than

`<x`

Sets the accumulator to 1 if the value of the accumulator is less than the value of `x`, 0 if not.

### Equal to

`=x`

Sets the accumulator to 1 if the value of the accumulator is equal to the value of `x`, 0 if not.

### Date

`xd`

Sets the accumulator to parts of the date depending on the value of `x`:

#### 0d

Sets the accumulator to the seconds part of the current time.

#### 1d

Sets the accumulator to the minutes part of the current time.

#### 2d

Sets the accumulator to the hour part of the current time.

#### 3d

Sets the accumulator to the day part of the current date.

#### 4d

Sets the accumulator to the month part of the current date.

#### 5d

Sets the accumulator to the year part of the current date.

#### Other

If the date is any other number (apart from 0, 1, 2, 3, 4, or 5), the accumulator is set to the current UNIX timestamp.

### CLS

`@`

Clears the current output.

### Delay

`x;`

Starts a time delay of `x` seconds, during which, no code is executed.

## Example

### Ascii table

#### Code

```33~j126(j^a~j)
```

#### Output

```"#\$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
```

### Fibonacci sequence

#### Code

```1~yI~k(xoi^<k{1}{44a32a}y+x~gy~xg~yi^~i)
```

#### Output

For input `30`:

```0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229
```

### Digital Clock

#### Code

```(@2do58a1d~S<10{1}{0o}So58a0d~S<10{1}{0o}So1;)
```

#### Output

This is just an example (output changes each second)

```16:57:06
```

## Interpreter

Find the Python interpreter here at CodePlex.

You can also find up to date two online interpreters here and here.