Shifted brainfuck

Shifted brainfuck is a brainfuck derivative which tells EOF well while reading.

+, -, <, >, [, ] work as original brainfuck. . outputs the current memory cell as char if it's not zero, or read input if it is, remaining zero in case there's no more input.

To avoid confusion when a character has code zero, each charcode is added by 1, e.g. \x00 => 1, 0 => 49.

Versions that each cell moduloed by 257, 65537, 1414113, 4294967296 or nothing exist.

Compared to 257-wrap brainfuck, this variant is somehow more elegant when inputting or outputting, e.g. for a cat:

.[.[-].]

Zero is better used for special handle. For exact chars, generator are no large difference, they need bunch of code.