Brainf-ck

This is a BRAINF-CK LANGUAGE INTERPRETER written on c++.Brainfuck is a minimalist language made by Urban Müller in 1993 just for fun and challenging coders.

SYNTAX

BRAINF-CK LANGUAGE has EIGHT SYMBOLS in total:

SYMBOL	ACTION
>	Increment the data pointer (to point to the next cell to the right).
<	Decrement the data pointer (to point to the next cell to the left).
+	Increment (increase by one) the byte at the data pointer.
-	Decrement (decrease by one) the byte at the data pointer.
.	Output the byte data pointer pointing at
,	Accept one byte of input, Store its value in the pointing byte.
[	If the byte at the data pointer is zero, then instead of moving the instruction pointer forward to the next command, jump it forward to the command after the matching ] command.
]	If the byte at the data pointer is nonzero, then instead of moving the instruction pointer forward to the next command, jump it back to the command after the matching [ command.

The file reader ignores everything after # in a line. It is not a brainfuck directive. Simply they are not passed to the interpreter. So you can write comments after #.

Output Mode

The default output mode of this interpreter is Memory Format. In memory format output is printed as follows: MEM[12] = 65 You can change the output mode via a directive using $.Put $ and write the mode name after it. Only writting first letter of the mode also works. All output modes supported yet are

Output Type	Command	Demo Output
MEMORY TYPE*	$M or $MEMORY	MEM[2] = 65
DECIMAL	$D or $DECIMAL	65
ASCII	$A or $ASCII	A

* - is the default output mode

How to run brainfuck codes

• From terminal:
  
  • Write $ g++ brainfuck.cpp -o brainfuck once to compile the brainfuck interpreter.
  • Write $ ./brainfuck filename.bf to interpret the filename.bf brainf-ck code.
  • or Write $ ./brainfuck only after that type your code in the terminal output.

Examples

Hello World

$ g++ brainfuck.c -o brainfuck
$ ./brainfuck hello.bf

$ASCII
#  Source : Wikipedia
#  This program prints "Hello World!" and a newline to the screen, its
#  length is 106 active command characters. [It is not the shortest.]
#
#  This loop is an "initial comment loop", a simple way of adding a comment
#  to a BF program such that you don't have to worry about any command
#  characters. Any ".", ",", "+", "-", "<" and ">" characters are simply
#  ignored, the "[" and "]" characters just have to be balanced. This
#  loop and the commands it contains are ignored because the current cell
#  defaults to a value of 0; the 0 value causes this loop to be skipped.
++++++++                # Set Cell #0 to 8
[
    >++++               # Add 4 to Cell #1; this will always set Cell #1 to 4
    [                   # as the cell will be cleared by the loop
        >++             # Add 2 to Cell #2
        >+++            # Add 3 to Cell #3
        >+++            # Add 3 to Cell #4
        >+              # Add 1 to Cell #5
        <<<<-           # Decrement the loop counter in Cell #1
    ]                   # Loop until Cell #1 is zero; number of iterations is 4
    >+                  # Add 1 to Cell #2
    >+                  # Add 1 to Cell #3
    >-                  # Subtract 1 from Cell #4
    >>+                 # Add 1 to Cell #6
    [<]                 # Move back to the first zero cell you find; this will
                        # be Cell #1 which was cleared by the previous loop
    <-                  # Decrement the loop Counter in Cell #0
]                       # Loop until Cell #0 is zero; number of iterations is 8
The result of this is:
Cell no :   0   1   2   3   4   5   6
Contents:   0   0  72 104  88  32   8
Pointer :   ^
>>.                     # Cell #2 has value 72 which is 'H'
>---.                   # Subtract 3 from Cell #3 to get 101 which is 'e'
+++++++..+++.           # Likewise for 'llo' from Cell #3
>>.                     # Cell #5 is 32 for the space
<-.                     # Subtract 1 from Cell #4 for 87 to give a 'W'
<.                      # Cell #3 was set to 'o' from the end of 'Hello'
+++.------.--------.    # Cell #3 for 'rl' and 'd'
>>+.                    # Add 1 to Cell #5 gives us an exclamation point
>++.                    # And finally a newline from Cell #6

Output: Hello World!

BONUS:

This interpreter comes with a transpiler which takes a string and outputs a brainf-ck code which prints the givern string.