Flow Uncontrolled

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Flow Uncontrolled is a language that requires self modification to do pretty much anything.


The language has three instructions, written like Python function calls. The instructions all have at least 1 argument.

Arguments can be strings, numbers, nil, read(x), cln(), or rand().

strings can have escaped quotation marks (\"), and now we need an escaped backslash (\\). read(x) returns the contents of line x. cln() returns the line # currently being run. rand(x, y) returns a random number between x and y.


The operations in the language include + and -, which only works if both sides are numbers; and concatenation(&), which works on any data type. Boolean operations include =, >, >, and !=(not equal)


The two instructions that write lines both overwrite the lines.

Instruction Action
out(x, y) Output the contents of line number x. If y is "Y" (without quotations), print with a newline.
input(x) Take a line of input and write it to line x
write(x, y, z,) Write y to line x if z evaluates to true. (z is optional, if it is not there the write will be unconditional)
| begin one-line comment

If you need multiple commands on one line, separate them with a colon.




Hello World

write(1, "Hello, World!")
out(1, N)


input(1) | overwrites itself with the input
write(cln() + 1, read(cln()), read(1) = 1) : out(1)
out(1, N)

Cat program

| input here
input(1) : write(cln() + 1, read(2), read(1) != nil) : out(1)

A+B problem

The two values must be placed on separate lines in STDIN due to how input() works

| A gets placed here
input(1) : input(3) | B overwrites this line
write(4, read(1) + read(2)) | result overwrites this line
out(4, Y)

99 bottles of beer

write(1, 99) | place the amount of bottles
write(2, " bottles of beer on the wall,")  | place all of the lyrics
write(3, " bottles of beer.")
write(4, "Take one down, pass it around,")
write(5, " bottles of beer on the wall.")
write(6, "1 bottle of beer on the wall,")
write(7, "1 bottle of beer.")
write(8, "No more bottles of beer on the wall.") 

| begin the printening
write(cln() + 1, "out(1, N) : out(2, Y) : out(1, N) : out(3, Y) : out(4, Y) : out(1, N) : write(1, read(1) - 1) : out(5, Y) : out(9, Y)", read(1) > 1) : write(cln() + 1, "out(6, Y) : out(7, Y) : out(4, Y) : out(8, Y)", read(1) = 1) : write(cln() + 2, read(cln()), read(1) > 0)