[e.b -- compute e
(c) 2016 Daniel B. Cristofani
http://brainfuck.org/]

>>>>++>+>++>+>>++<+[
  [>[>>[>>>>]<<<<[[>>>>+<<<<-]<<<<]>>>>>>]+<]>-
  >>--[+[+++<<<<--]++>>>>--]+[>>>>]<<<<[<<+<+<]<<[
    >>>>>>[[<<<<+>>>>-]>>>>]<<<<<<<<[<<<<]
    >>-[<<+>>-]+<<[->>>>[-[+>>>>-]-<<-[>>>>-]++>>+[-<<<<+]+>>>>]<<<<[<<<<]]
    >[-[<+>-]]+<[->>>>[-[+>>>>-]-<<<-[>>>>-]++>>>+[-<<<<+]+>>>>]<<<<[<<<<]]<<
  ]>>>+[>>>>]-[+<<<<--]++[<<<<]>>>+[
    >-[
      >>[--[++>>+>>--]-<[-[-[+++<<<<-]+>>>>-]]++>+[-<<<<+]++>>+>>]
      <<[>[<-<<<]+<]>->>>
    ]+>[>>>>]-[+<<<<--]++<[
      [>>>>]<<<<[
        -[->--[<->+]++<[[>-<+]++[<<<<]+>>+>>-]++<<<<-]
        >-[+[<+[<<<<]>]<+>]+<[->->>>[-]]+<<<<
      ]
    ]>[<<<<]>[
      -[
        -[
          +++++[>++++++++<-]>-.>>>-[<<<----.<]<[<<]>>[-]>->>+[
            [>>>>]+[-[->>>>+>>>>>>>>-[-[+++<<<<[-]]+>>>>-]++[<<<<]]+<<<<]>>>
          ]+<+<<
        ]>[
          -[
            ->[--[++>>>>--]->[-[-[+++<<<<-]+>>>>-]]++<+[-<<<<+]++>>>>]
            <<<<[>[<<<<]+<]>->>
          ]<
        ]>>>>[--[++>>>>--]-<--[+++>>>>--]+>+[-<<<<+]++>>>>]<<<<<[<<<<]<
      ]>[>+<<++<]<
    ]>[+>[--[++>>>>--]->--[+++>>>>--]+<+[-<<<<+]++>>>>]<<<[<<<<]]>>
  ]>
]

This program computes the transcendental number e, in decimal. Because this is
infinitely long, this program doesn't terminate on its own; you will have to
kill it. The fact that it doesn't output any linefeeds may also give certain
implementations trouble, including some of mine.