Fuck4

Fuck4 is four command esoteric language. Fuck4 machine by default has 8 half-bytes 0-127, but this is not strict. In any case memory is finite and looped, this why only one-way pointer shift is required.

Commands

Fuck4 has four commands: f,u,c,k.

• f : increases current byte (brainfuck equivalent: +)
• u : starts loop if current byte not null (brainfuck equivalent: [)
• c : increases pointer position (brainfuck equivalent: >)
• k : ends loop if current byte is null (brainfuck equivalent: ])

+,[,>,] operators can be used instead of f,u,c,k

Stdin/out:

• input: after leaving second memory cell which is set to 2, first memory cell receives input
• output: after leaving second memory cell which is set to 1, first memory cell is printed out

Second cell automatically clears on each pass.

Hello, world!

ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffcfccccc
ccfffffffffffffffffffffffffffffcfcccccccfffffffcfccccccccfcccccccfffcfcccccccuf
kffffffffffffffffffffffffffffffffffffffffffffcfcccccccufkffffffffffffffffffffff
ffffffffffcfcccccccffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
fffffffffffffffffffffffffffcfcccccccufkffffffffffffffffffffffffffffffffffffffff
fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffcfcccccc
cfffcfcccccccufkfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
fffffffffffffffffffffffffffffffffffffffffffffcfcccccccufkffffffffffffffffffffff
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffc
fcccccccufkfffffffffffffffffffffffffffffffffcfc

Fuck4 to C translator on Python:

# http://bfe.host.org/fuck4.html
# fuck4 to C translator code in Python
from sys import argv
if argv.__len__()==1:
    print("usage: "+argv[0]+" input.fuck [out.c] [memsize] [bytecap]")
    print("default memsize is 8, default bytecap is 127")
else:
    input = argv[1]
    output = input+".c"    
    MEMSIZE = 8
    BYTECAP = 127
    if argv.__len__()==3:
        output = argv[2]
    if argv.__len__()==4:
        MEMSIZE = int(argv[3])
    if argv.__len__()==5:
        BYTECAP = int(argv[4])        
    r = open(input,'r')
    w = open(output,'w')
    if BYTECAP>255:
        BYTECAP=255
    if BYTECAP<1:
        BYTECAP=1
    if MEMSIZE<8:
        MEMSIZE=8
    w.write(" unsigned int p = 0, memsize = "+str(MEMSIZE)+"; char mem["+str(MEMSIZE)+"]; int main() { \n");
    code = r.read()
    r.close()
    p = 0
    sbv = 0
    for x in code:
        if x=="f" or x=="+":
            w.write(" if (mem[p] == "+str(BYTECAP)+") { mem[p] = 0; } else { ++mem[p]; } \n")
            if p==1:
                if sbv==BYTECAP:
                    sbv=0
                else:
                    sbv+=1                
        if x=="u" or x=="[":
            w.write(" while(mem[p]) { \n");
        if x=="c" or x==">":        
            if p==MEMSIZE-1:
                p=0
            else:
                p+=1
            if p==2 and sbv==1:
                w.write(" if (mem[1]==1) putchar(mem[0]); mem[1]=0; \n")                
                sbv=0
            if p==2 and sbv==2:
                w.write(" if (mem[1]==2) mem[0] = getchar(); mem[1]=0; \n")                
                sbv=0
            w.write("  if (p == "+str(MEMSIZE)+"-1) { p = 0; } else { p++; } \n")
        if x=="k" or x=="]":
            w.write(" } \n")
    w.write(" } //\n\n")
    w.close()

External resources

• fuck4 homepage with Python-based translator to C