| // $G $F.go && $L $F.$A && ./$A.out |
| |
| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main |
| |
| // brainfuck |
| |
| var p, pc int |
| var a [30000]byte |
| const prog = "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.!" |
| |
| func scan(dir int) { |
| for nest := dir; dir*nest > 0; pc += dir { |
| switch prog[pc+dir] { |
| case ']': |
| nest-- |
| case '[': |
| nest++ |
| } |
| } |
| } |
| |
| func main() { |
| for { |
| switch prog[pc] { |
| case '>': |
| p++ |
| case '<': |
| p-- |
| case '+': |
| a[p]++ |
| case '-': |
| a[p]-- |
| case '.': |
| print(string(a[p])) |
| case '[': |
| if a[p] == 0 { |
| scan(1) |
| } |
| case ']': |
| if a[p] != 0 { |
| scan(-1) |
| } |
| default: |
| return |
| } |
| pc++ |
| } |
| } |