| 1234567891011121314151617181920212223242526272829303132333435363738394041 |
- [ 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 a "comment loop", it's 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.
- ]
- +++++ +++ 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 till 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 till 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
|
