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Waterfall
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Waterfall is designed by PSTF. It is somewhat related to Brainfuck.
Command Set
This program has two data storage: one is a tape, another is three accumulators (a, b, c).
| Command | Meaning |
|---|---|
| > | Move the pointer right by b. |
| < | Move the pointer left by b. |
| + | Increase the pointed cell by a. |
| - | Decrease the pointed cell by a. |
| A | Add a by 1. |
| a | Subtract a by 1. |
| B | Add b by 1. |
| b | Subtract b by 1. |
| C | Add c by 1. |
| c | Subtract c by 1. |
| / | Swap the value of A and C. |
| \ | Swap the value of B and C. |
| , | Input a character and store it to current cell. |
| . | Output the value of current cell as character. |
| ; | Input an integer ended by a white character and store it to current cell. |
| : | Output the value of current cell as number. |
| ^ | Transfer the value of C to the current cell. |
| v | Transfer the value of the current cell to C. |
| [ | Jump to the matching bracket if current cell is 0. |
| ] | Jump back to the matching bracket if current cell isn't 0. |
| { | Jump to the matching brace. |
| } | Do nothing, but must paired. |
| * | Multiply the current cell by A. |
| ` | Divide the current cell by A, result in quotient. |
| % | Divide the current cell by A, result in remainder. |
| 0 | Clear the current cell. |
| # | NOP. |
| @ | Halt. |
Examples
A+B Problem
A;>;[-<+>]<: