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Q&A

Befunge Golfing Tips

+5
−0

Post tips for Befunge code golf here!

This is based on a type of question I used to see on CGCC, where people would post tips for golfing in various languages. They happened to be quite helpful, so I thought it'd be nice to bring them back.

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3 answers

+3
−0

Golfing numbers

Numbers above 15 and below zero take more than one byte to create. Here's a table of numbers up to 100 (Not including negatives yet)

Table for '98

NOTE: For numbers that are also valid ASCII characters, it can be smaller to use " " to insert them. This isn't included in the table, as you can easily work this out yourself. 0..31 and 127 a hex editor to insert this way.

Number Solution
16 f1+
17 f2+
18 f3+
19 f4+
20 f5+
21 f6+
22 f7+
23 f8+
24 f9+
25 fa+
26 fb+
27 fc+
28 fd+
29 fe+
30 ff+
31 ff1++
32 48*
33 b3*
34 f2+2*
35 57*
36 66*
37 66*1+
38 f4+2*
39 d3*
40 a4*
41 a4*1+
42 67*
43 67*1+
44 b4*
45 59*
46 59*1+
47 59*2+
48 68*
49 77*
50 a5*
51 f2+3*
52 d4*
53 d4*1+
54 69*
55 b5*
56 78*
57 78*1+
58 78*2+
59 78*3+
60 a6*
61 a6*1+
62 a6*2+
63 79*
64 88*
65 d5*
66 6b*
67 6b*1+
68 6b*2+
69 6b*3+
70 a7*
71 a7*1+
72 89*
73 89*1+
74 89*2+
75 5f*
76 5f*1+
77 b7*
78 6d*
79 6d*1+
80 8a*
81 99*
82 99*1+
83 99*2+
84 7c*
85 7c*1+
86 7c*2+
87 7c*3+
88 8b*
89 8b*1+
90 9a*
91 7d*
92 7d*1+
93 7d*2+
94 7d*3+
95 7d*4+
96 c8*
97 c8*1+
98 e7*
99 b9*
100 aa*
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General comments (1 comment)
+3
−0

Exploiting layout

Make it thin

Newlines and indentation are expensive, so remove them when possible. Some examples:

&v factorial
v<   >
>:1-:| v* <
     >$>\:|
          >$.@

Can be golfed significantly by removing |, which requires at least 3 lines

&>:1-:#v_$>\:#v_$.@
 ^     <  ^*  <

It could probably be golfed further by using unefunge-98 and the j command to remove the second line.

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+2
−0

Bitwise operations

(WIP)

Befunge, rather pointedly, lacks bitwise ops. No shifts, no and, no or, no xor.

Shifts

Shifts can be implemented as multiplication and division by powers of two. Shifts by arbitrary amounts can be done with successive multiplication/division by two. Rendered tricky by negatives, all shifts below are only functional with 31 bits and leave 32nd untouched.

Shift by n

Left shift

v
v
>1-\2*v
^_v#:\<
  $
  v
  v

Right shift

v
v
>1-\2/v
^_v#:\<
  $
  v
  v

Bidirectional shift (negative is right)

Note: not particularly golfed.

v
v
>:0`#v_0-v
v    < v <
>1-\2*v>1-\2\v
^_v#:\<^_v#:\<
  v      <
  $
  v
  v
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