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| 1 | [ This program prints "Hello World!" and a newline to the screen, its | ||
| 2 | length is 106 active command characters. [It is not the shortest.] | ||
| 3 | |||
| 4 | This loop is an "initial comment loop", a simple way of adding a comment | ||
| 5 | to a BF program such that you don't have to worry about any command | ||
| 6 | characters. Any ".", ",", "+", "-", "<" and ">" characters are simply | ||
| 7 | ignored, the "[" and "]" characters just have to be balanced. This | ||
| 8 | loop and the commands it contains are ignored because the current cell | ||
| 9 | defaults to a value of 0; the 0 value causes this loop to be skipped. | ||
| 10 | |||
| 11 | from https://en.wikipedia.org/wiki/Brainfuck#Hello_World! | ||
| 12 | ] | ||
| 13 | ++++++++ Set Cell #0 to 8 | ||
| 14 | [ | ||
| 15 | >++++ Add 4 to Cell #1; this will always set Cell #1 to 4 | ||
| 16 | [ as the cell will be cleared by the loop | ||
| 17 | >++ Add 2 to Cell #2 | ||
| 18 | >+++ Add 3 to Cell #3 | ||
| 19 | >+++ Add 3 to Cell #4 | ||
| 20 | >+ Add 1 to Cell #5 | ||
| 21 | <<<<- Decrement the loop counter in Cell #1 | ||
| 22 | ] Loop until Cell #1 is zero; number of iterations is 4 | ||
| 23 | >+ Add 1 to Cell #2 | ||
| 24 | >+ Add 1 to Cell #3 | ||
| 25 | >- Subtract 1 from Cell #4 | ||
| 26 | >>+ Add 1 to Cell #6 | ||
| 27 | [<] Move back to the first zero cell you find; this will | ||
| 28 | be Cell #1 which was cleared by the previous loop | ||
| 29 | <- Decrement the loop Counter in Cell #0 | ||
| 30 | ] Loop until Cell #0 is zero; number of iterations is 8 | ||
| 31 | |||
| 32 | The result of this is: | ||
| 33 | Cell no : 0 1 2 3 4 5 6 | ||
| 34 | Contents: 0 0 72 104 88 32 8 | ||
| 35 | Pointer : ^ | ||
| 36 | |||
| 37 | >>. Cell #2 has value 72 which is 'H' | ||
| 38 | >---. Subtract 3 from Cell #3 to get 101 which is 'e' | ||
| 39 | +++++++..+++. Likewise for 'llo' from Cell #3 | ||
| 40 | >>. Cell #5 is 32 for the space | ||
| 41 | <-. Subtract 1 from Cell #4 for 87 to give a 'W' | ||
| 42 | <. Cell #3 was set to 'o' from the end of 'Hello' | ||
| 43 | +++.------.--------. Cell #3 for 'rl' and 'd' | ||
| 44 | >>+. Add 1 to Cell #5 gives us an exclamation point | ||
| 45 | >++. And finally a newline from Cell #6 | ||