s2dlang

Instructions:
    ^   -> moves IP up
    >   -> moves IP right
    v   -> moves IP down
    <   -> moves IP left

    +   -> pops two values and pushes their sum
    -   -> pops two values and pushes their difference

    ]   -> pops a value; if it is 0, next instruction in IP direction is skipped, direction becomes right
    [   -> pops a value; if it is 0, next instruction in IP direction is skipped, direction becomes left

    @   -> pops a value and discards it
    $   -> swaps top two values on stack
    !   -> duplicates top value on stack

    .   -> pops a value and prints it as an integer
    '   -> pops a value and prints it as a character
    ,   -> reads a character from stdin and pushes it

    0-9 -> pushes an integer between 0 and 9

    &   -> start of program; direction = right
    %   -> end of program

Examples:
    Infinite Loop:
        >v
        ^<

    Cat:
        &>,'v
         ^  <

    Loop:
        &01+!'v
          ^   <