ETC

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ETC, standing for both "etc." and ETC and ETC, is a minimalist esolang, created by user:Elbereth, with only 3 commands excluding NOP: E, T, C.

E 

increments counter by 1;

T 

multiplies counter by 2;

C 

jump to command with position same as the counter. However, if the counter points to the same location, to prevent an infinite loop, it acts as E but also prints the ASCII/Unicode character represented by value of the counter.

All other characters are NOP; The standard form is .

Note the counter increments are done modulo the program size, which means that infinite loops are still possible and very easy to make, for example:

CCCTC

Computational class

ETC is a FSA, because you only need to store the counter modulo (1114111*the program size) to store all information you need. however, if you need to store the accumulator, it's easy to prove that a normal PDA can't cope with the case, making it sub-Turing-complete.

Examples

XKCD Random Number

ettttteeeeeeeeeeeeeeeeeeee                          Chosen by fair di e roll. Guarenteed to be random.

etc.py

program = input('Program: ').upper()
index = 0
counter = 0
while index < len(program):
    if program[index] == 'E':
        counter += 1
    elif program[index] == 'T':
        counter *= 2
    elif program[index] == 'C':
        if index == counter:
            print(chr(index), end="")
            counter += 1
        else:
            index = counter - 1
    index %= len(program)
    counter %= len(program)
    index += 1