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35 lines
1.2 KiB
35 lines
1.2 KiB
6 years ago
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## brainfuck
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### Instructions
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Write a Brainfuck interpreter program.
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The source code will be given as first parameter.
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The code will always be valid, with no more than 4096 operations.
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Brainfuck is a minimalist language. It consists of an array of bytes
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(in our case, let's say 2048 bytes) initialized to zero,
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and a pointer to its first byte.
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Every operator consists of a single character :
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- '>' increment the pointer ;
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- '<' decrement the pointer ;
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- '+' increment the pointed byte ;
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- '-' decrement the pointed byte ;
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- '.' print the pointed byte on standard output ;
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- '[' go to the matching ']' if the pointed byte is 0 (while start) ;
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- ']' go to the matching '[' if the pointed byte is not 0 (while end).
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Any other character is a comment.
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And its output :
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```console
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student@ubuntu:~/student/brainfuck$ go build
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student@ubuntu:~/student/brainfuck$ ./brainfuck "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>." | cat -e
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Hello World!$
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student@ubuntu:~/student/brainfuck$ ./brainfuck "+++++[>++++[>++++H>+++++i<<-]>>>++\n<<<<-]>>--------.>+++++.>." | cat -e
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Hi$
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student@ubuntu:~/student/brainfuck$ ./brainfuck | cat -e
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$
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student@ubuntu:~/student/brainfuck$
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```
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