30
\$\begingroup\$

Source Code Byte Frequency


Write a program that get a single byte character as an input and prints the frequency of that byte in the program's source code as an output.

Examples:

Assuming my program is: ab#cd%b then the output of the program should be (each line is a separate execution):

input         output
-----         ------
  a           0.1428571428571429
  b           28.57%
  #           14.2857143%
  c           1/7
  B           0

Rules:

  • The format of the proportion does not need to be consistent across all inputs, e.g. a fraction for one, decimal for another, percent for a third, plain zero for non-existent byte, etc...
  • If a proportion is represented as decimal, the result must be accurate to at least 4 decimal places.
  • Source code should be at least 1 byte long.

Scoring:

This is - the shortest code (≥1) wins.


(It would also be fun to get the shortest code in every language, so don't hesitate to post multiple entries)

\$\endgroup\$
  • \$\begingroup\$ I assume characters not in the source code will not be given as input? \$\endgroup\$ – golf69 Aug 9 at 17:21
  • 4
    \$\begingroup\$ Actually they can be given as an input, with output of 0. I'll edit the examples with such a case, thank you. \$\endgroup\$ – SomoKRoceS Aug 9 at 17:24
  • 1
    \$\begingroup\$ @user202729 @SomoKRoceS @caird coinheringaahing It is correct that the self-referential tag precludes reading the source code, BUT this tag was added after the OP had already clarified that this was Ok, and after answers that already used that approach. \$\endgroup\$ – Dominic van Essen Aug 10 at 11:15
  • 1
    \$\begingroup\$ I feel like this would also be a good code-bowling question \$\endgroup\$ – user Aug 10 at 21:07
  • 2
    \$\begingroup\$ Does the proportion format need to be consistent? Your example seems to suggest that it is legal to use a fraction for one type of character, a decimal for one, and a percentage for another. \$\endgroup\$ – Beefster Aug 10 at 22:24

27 Answers 27

31
\$\begingroup\$

JavaScript (ES6), 40 bytes

All used characters appear exactly twice. Therefore, this returns either 0 or 2/40 = 0.05.

F=_=>(F+'+./02>cdeilnsu').includes(_)/20

Try it online!

| improve this answer | |
\$\endgroup\$
29
\$\begingroup\$

Retina 0.8.2, 1 byte

1

Try it online! Link includes... test cases? But there's not much to test really. The program counts the number of 1s in the input, so if the input is 1, then this is 100% of the program's code, and the program outputs 1 accordingly, otherwise the input character is not in the program's code, and therefore the output is 0.

| improve this answer | |
\$\endgroup\$
  • 6
    \$\begingroup\$ would any one-character retina program work? \$\endgroup\$ – golf69 Aug 9 at 19:09
  • 6
    \$\begingroup\$ @golf69 Anything except a newline or a pilcrow, I guess. (A newline is a cat program and a pilcrow counts newlines, not pilcrows.) \$\endgroup\$ – Neil Aug 9 at 21:38
11
\$\begingroup\$

Python 2, 52 50 bytes

s="print`'s=;exec s'+s`.count(input())/50.";exec s

Try it online!


Python 3.8 (pre-release), 53 bytes

exec(s:="print(('exec(s:=%r)'%s).count(input())/53)")

Try it online!


Python 3, 55 bytes

s="print(('s=%r;exec(s)'%s).count(input())/55)";exec(s)

Try it online!

| improve this answer | |
\$\endgroup\$
  • 4
    \$\begingroup\$ What is wrong with static data? @RahulVerma \$\endgroup\$ – golf69 Aug 9 at 19:11
  • 1
    \$\begingroup\$ Okay, I think I was wrong about this site @golf69. So, I'd also did the same in mine. \$\endgroup\$ – Vrintle Aug 10 at 2:13
  • \$\begingroup\$ What is "pre-release" about Python 3.8? \$\endgroup\$ – lights0123 Aug 10 at 18:34
  • 1
    \$\begingroup\$ @lights0123 It's an artefact of TIO - when 3.8 was added to the site it was in pre-release. The site hasn't been updated with a more accurate name yet. \$\endgroup\$ – FryAmTheEggman Aug 10 at 19:21
8
\$\begingroup\$

Actually, 5 bytes

5○Qc/

Try it online!

Explanation

 ○    Push the byte of input
  Qc  Count how many times it's in the source code
5   / And divide by five
| improve this answer | |
\$\endgroup\$
8
\$\begingroup\$

Unary, 984300017036808782386566988923477659239141055737914322948 (~9.84e57) ... 3,584,048,420,501,996,611,055,242,007,187,782,470,471,244 (~3.58e42) 59,599,717,533,291,089,242,285,960,261,852 (~5.96e31) bytes thanks to Jo King!

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in the world have you scrolled this far? It's Unary - it's just going to be zeroes forever...

Outputs 1 if the input is 0, 0 otherwise.

This absolutely did not happen because I misread the question as code bowling instead of code golf.


Jo King's golfed brainf*** code (only 35 bytes)

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

Try it online!


Previous brainf*** code:

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

I used the code from this answer to generate Unary from the original brainf*** code.

Explanation of brainf*** code:

  • ++++++++ sets the first cell (cell 1) to 8
  • [->++++++>++++++<<] keeps decrementing cell 1 and adding 6 to cells 2 and 3 as long cell 1 is not 0. Basically it sets cells 2 and 3 to 48 ('0')
  • , reads the input and stores it in cell 1
  • [->-<]> decrements cells 1 and 2 as long as cell 1 is not 0, then moves the pointer to cell 2
  • Now different things happen depending on the value of cell 3:
    • If cell 3 is 0, i.e., the input was 48 ('0'):
      • [>] is a loop that is never entered, since cell 3 is 0
      • > moves it to cell 3 (whose value is 48)
      • [+>>] increments cell 3 (makes its value 49/'1'), and moves 2 cells to the right to cell 5. Since cell 5 is 0 at the start, it exits the loop after that first iteration
    • If cell 3 is not 0, i.e., the input was not '0':
      • [>] moves the pointer forward until it reaches a cell whose value is 0. That cell is cell 4
      • > moves it to cell 5
      • [+>>] is a loop that is never entered, since cell 5 is already 0
  • <<. moves it 2 cells back to cell 3 and prints its value. If the input was '0', the value was incremented to 49, and if not, it should still be 48.
| improve this answer | |
\$\endgroup\$
  • 6
    \$\begingroup\$ For a solid quarter of a second there I was really impressed with how well my browser was handling that code block. \$\endgroup\$ – Sellyme Aug 11 at 6:56
  • 2
    \$\begingroup\$ Personally I wouldn't use the word "thought". \$\endgroup\$ – Sellyme Aug 11 at 13:04
  • 1
    \$\begingroup\$ You can do more efficient constant generation with generating 3. 32 bytes \$\endgroup\$ – Jo King Aug 14 at 23:25
  • 1
    \$\begingroup\$ Well, the code relies on wrapping eight bit cells and EOF as zero (that last one might be what's stopping you). First, decrement to get to 255, then loop by subtracting five each time, which is 255/5=51='3'. Subtract input from this as usual, then if the input was not 3, then subtract one from the output cell and reset this cell using ,, which in this case acts like [-]. Finally subtract 2 from the output cell to get it from 3/2 to 1/0 and print \$\endgroup\$ – Jo King Aug 15 at 23:26
  • \$\begingroup\$ Oh, hmm. I forgot that Unary only uses 0 (mixed it up with Lenguage). In that case it would be 35 bytes \$\endgroup\$ – Jo King Aug 15 at 23:38
7
\$\begingroup\$

Japt, 2 bytes

èè

Try it

Explanation

Counts number of times è occurs in the input. So outputs 1 if input is è otherwise 0

| improve this answer | |
\$\endgroup\$
  • 3
    \$\begingroup\$ Goddamnit! I completely overthought this one! And I've used that exact trick in other, similar challenges! \$\endgroup\$ – Shaggy Aug 10 at 14:59
6
\$\begingroup\$

APL (Dyalog Unicode), inspecting its own source code, 20 bytes

 f←{(+/÷≢)⍵=,⎕CR'f'}

Try it online!

Note the leading space in the code. When a function is defined in APL, the interpreter converts the source code to its own whitespace formatting (strips most spaces but inserts some at certain places, including the start of each line). The system functions that retrieve the source code (e.g. ⎕CR and ⎕NR) give the converted representation.

f← part cannot be removed from the score because the source inspection depends on itself being defined as f.

⎕CR'f'  ⍝ Get the char matrix representation of function f
,       ⍝ Convert the 1-row matrix to a vector
⍵=      ⍝ Compare each char of above with the input char
(+/÷≢)  ⍝ Compute the average

APL (Dyalog Unicode), quine-like, 26 bytes

(+/÷≢)⍞=13⍴'''(+/÷≢)⍞=13⍴'

Try it online!

There is no escape sequence in APL's string literal. Instead, one single quote is represented by two single quotes, so the literal '''(+/÷≢)⍞=13⍴' gives the string '(+/÷≢)⍞=13⍴.

'...'   ⍝ Start with the string literal
13⍴     ⍝ Cycle-take first 13 chars, adding `'` at the start to the end
⍞=      ⍝ Compare with single-char input from stdin
(+/÷≢)  ⍝ Compute the average
| improve this answer | |
\$\endgroup\$
  • \$\begingroup\$ Is there a special encoding where these characters are representable with 20 bytes? I’m just wondering, since the input is supposed to be a “single byte character”, isn’t it possible to write an APL program consisting of non-ASCII characters only and always writing 0 as result… \$\endgroup\$ – Holger Aug 11 at 14:22
  • \$\begingroup\$ @Holger The page linked at the "bytes" text defines the single-byte character set for Dyalog APL. \$\endgroup\$ – Bubbler Aug 11 at 14:27
  • \$\begingroup\$ Ok, that’s for the posted programs. But alternatively, what if you don’t use it. Is it possible to write a program only consisting of multi-byte characters (assuming, e.g. UTF-8) and always evaluating to zero (as for this challenge, the input always is a “single byte character” which never matches)? \$\endgroup\$ – Holger Aug 11 at 14:35
  • 1
    \$\begingroup\$ @Holger There's a 2-char 6-byte Unicode-only program that prints 0, but I don't think it fulfills the task because the source code actually contains 6 bytes e2 89 a2 e2 8d ac and the task is to "print the frequency of that byte". \$\endgroup\$ – Bubbler Aug 11 at 22:55
  • \$\begingroup\$ That’s great. Well, the OP has to tell whether we can take “single byte character as an input” literally… \$\endgroup\$ – Holger Aug 12 at 7:45
6
\$\begingroup\$

JavaScript (Node.js),  61  34 bytes

-16 bytes thanks to MatthewJensen

-11 bytes thanks to Arnauld

f=c=>--('f='+f).split(c).length/34

Try it online!

| improve this answer | |
\$\endgroup\$
  • 5
    \$\begingroup\$ Since you use f in your code, you have to include its definition in your byte count (by adding f= to the start of your code. You will also have to edit it to s='f='+f.toString() to retain functionality. \$\endgroup\$ – Matthew Jensen Aug 9 at 21:21
  • \$\begingroup\$ You can also save 6 bytes by hardcoding s.length. \$\endgroup\$ – Matthew Jensen Aug 9 at 21:28
  • 3
    \$\begingroup\$ Also, you don't need ().toFixed(4). The challenge only specifies that the result must be accurate to 4 decimal places, not that it must be truncated. \$\endgroup\$ – Arnauld Aug 9 at 21:34
  • 4
    \$\begingroup\$ With all these changes you can reduce your answer to 34 bytes: f=c=>--('f='+f).split(c).length/34. \$\endgroup\$ – Matthew Jensen Aug 9 at 21:40
5
\$\begingroup\$

Io, 126 bytes

method(h,"mmmeeettthhhooodd((((,,,,aaaaassssMuubl  pppn34L))))iif==102/6"asMutable append(34)asList map(o,if(o==h,1,0))sum/62)

Try it online!

| improve this answer | |
\$\endgroup\$
5
\$\begingroup\$

05AB1E, 26 23 bytes

-3 bytes by using the shortest standard quine in 05AB1E.

0"D34çýI¢23/"D34çýI¢23/

Try it online!

Explanation

0                       Push a 0 for double quote insertion later.
 "D34çýI¢23/"           Push the quine string.
             D          Duplicate the quine string.
              34çý      Insert a double quote between rach item on the stack.
                  I¢    Count how many times the input appeaes
                    23/ And divide by 23.
| improve this answer | |
\$\endgroup\$
5
\$\begingroup\$

MATL, 14 bytes

39'39m7/h'hm7/

Try it online!

Each byte is present exactly twice in the source code. Therefore each byte has a frequency of either 1/7 or 0.

39       % Push code-point for '
'39m7/h' % Push literal char array
h        % Horizontally concatenate. Automatically converts to char array.
m        % Ismember: is input in this char array?
7/       % Divide by seven
| improve this answer | |
\$\endgroup\$
5
\$\begingroup\$

PHP, 63 60 bytes

fn($a)=>strstr('ffnn($a)==>>str\\\',,??11//220::',$a)?1/20:0

Try it online!

Much better solution than the first version, each char is present 3 times so if it is found, results in 3/63.

EDIT: saved 3 bytes by re-using n as var name (I had the luck that the total count still saved the repetition of all numbers for the calculus)

EDIT2: fixed the problem that n wasn't counted for not being in the string, manages to keep it 60 by removing " and introducing \ (thanks to Dom Hastings)

EDIT3: fixed the problem with 0 wasn't counted because it was at the end (thanks to Dominic van Essen)

| improve this answer | |
\$\endgroup\$
  • 1
    \$\begingroup\$ Unfortunately, this doesn't count n now, presumably because of the re-use... I did wonder if there was a way to use stringwise XOR to avoid having both quotes, not sure if that would help you? f^A == '... \$\endgroup\$ – Dom Hastings Aug 10 at 14:00
  • \$\begingroup\$ @DomHastings good catch! I'll try to fix this, also the second quote is here just because I cannot introduce a ' in the string without using a `\`, I could get rid of it maybe, it was for the first version \$\endgroup\$ – Kaddath Aug 10 at 14:15
  • 2
    \$\begingroup\$ @DomHastings should be fixed now ;) \$\endgroup\$ – Kaddath Aug 10 at 14:25
  • \$\begingroup\$ 57 bytes by using .05 instead of 1/20. \$\endgroup\$ – Dominic van Essen Aug 10 at 16:19
  • 1
    \$\begingroup\$ So just one more comment: you shouldn't end the string with a 'lonely' character, or the strstr approach will fail (as it currently does for the character '0'... I think you need to swap '::' and '0' ... \$\endgroup\$ – Dominic van Essen Aug 11 at 7:48
5
\$\begingroup\$

R, 77 75 bytes

Edit: -2 bytes thanks to Giuseppe

f <-function(c)sum(c==unlist(strsplit(capture.output(dump("f","")),"")))/75

Try it online!

Uses R dump(,"") function to output own source code*, capturing output (normally to the console) using capture.output(). Then finds the number of matches to the function argument c, divided by the source code length (75 bytes).

*Note that the TIO interface gives slightly differently-formatted output from the dump() function to running directly in R, so counts of whitespace characters are inaccurate in TIO (but correct in R).


R (without reading own source code), 106 bytes

'->p;sum(gregexpr(scan(,""),sQuote(p),f=T)[[1]]>0)/53'->p;sum(gregexpr(scan(,""),sQuote(p),f=T)[[1]]>0)/53

Try it online!

Same Similar approach to above, but including quoted string instead of reading the source code itself.

| improve this answer | |
\$\endgroup\$
  • \$\begingroup\$ 75 bytes for the dump() solution \$\endgroup\$ – Giuseppe Aug 11 at 17:21
  • \$\begingroup\$ Thanks again Giuseppe! \$\endgroup\$ – Dominic van Essen Aug 13 at 14:07
5
\$\begingroup\$

Ruby -nl, 56...38 36 bytes (without reading own source code)

p~%r,[+-2\[-\]p~%r+2?./8:],?1.0/18:0

Try it online!

Each of the 18 distinct characters in the code appears twice. The input is tested against a comma-delimited regexp. The outer [] is a character class containing literal characters plus two character ranges: +-2 is equivalent to the literal characters +,-./012 and \[-\] is equivalent to the literal characters [\]. The code prints 0.05555555555555555 (decimal expansion of 1.0/18) if the regexp matches the input character; 0 is printed otherwise.


Ruby -nl, 27 bytes (reads own source code)

p (IO.read($0).count$_)/27r

Try it online!

Reads its own source and counts occurrences of the input. Output is a rational number.


Ruby -nl + coreutils, 24 bytes (reads own source code)

p`cat #$0`.count($_)/24r

Try it online!

Same as above but uses cat (from coreutils) to read the source.

| improve this answer | |
\$\endgroup\$
5
\$\begingroup\$

x86 machine code (MS-DOS .COM format), 53 49 44 bytes

Edit: Saved 4 bytes by eliminating a redundant CALL/RET and 5 bytes by outputting via INT 29H.

Input is taken from the command line: no input will search for NUL (hex 00H). Result is in the form "00/00" (i.e. "03/44" for an input of ")").

The counting part is really easy since this is a COM program: I scan for the target byte starting at DS:100H until I hit the end of the program code. To print the result and total counts, I use AAM to convert the numbers into unpacked BCD (which will always be less than 99) and then print the digits after flipping them so that they're displayed in the correct order.

Hex dump:

A0 82 00 B9 2C 00 33 D2 BF 00 01 F2 AE E3 03 42 EB F9 8B C2 E8 07 00 B0 2F CD 29 B8 2C 00 D4 0A 05 30 30 86 E0 CD 29 86 E0 CD 29 C3

TASM source for generated code:

IDEAL

MODEL   TINY
CODESEG
ORG 100H

PSIZE   EQU PEND-MAIN
PLEN    EQU PSIZE+1     ; Loop needs to be one larger so we can break on CX=0

MAIN:
    MOV     AL,[0082H]  ; Get search value from the command line
    MOV     CX,PLEN
    XOR     DX,DX
    MOV     DI,100H     ; Start search from the beginning of the program
CLOOP:
    REPNZ   SCASB       ; Search for value
    JCXZ    CDONE       ; Exit when at end of string
    INC     DX
    JMP     CLOOP
CDONE:
    MOV     AX,DX
    CALL    DISPNUM
    MOV     AL,'/'
    INT     29H
    MOV     AX,PSIZE
    ; Fallthrough to print last number and exit

DISPNUM:
    AAM                 ; Convert value to unpacked BCD (AH:AL)
    ADD     AX,3030H
    XCHG    AH,AL
    INT     29H
    XCHG    AH,AL
    INT     29H
    RET

PEND:

END MAIN
ENDS
| improve this answer | |
\$\endgroup\$
4
\$\begingroup\$

Pyth, 14 bytes

c/+N"c/+NQ7"Q7

Try it online!

Explanation

c/+N"c/+NQ7"Q7
    "c/+NQ7"    # String literal
  +N            # Prepend '"'
 /          Q   # Count occurrences of the input in that string
c            7  # Divide by 7
| improve this answer | |
\$\endgroup\$
4
\$\begingroup\$

Google Sheets, 51

Input is in B1.

=LEN(REGEXREPLACE(FORMULATEXT(A1),"[^"&B1&"]",))/51

For once, we can't use the auto-close trick because the calculation would be wrong.

| improve this answer | |
\$\endgroup\$
4
\$\begingroup\$

C (gcc), 225 221 217 203 197 bytes

-28 bytes ceilingcat

char*t,r;main(i,s){for(i=getchar(asprintf(&t,s="char*t,r;main(i,s){for(i=getchar(asprintf(&t,s=%c%s%1$c,34,s));*t;r+=*t++==i);printf(%1$c%%d/197%1$c,r);}",34,s));*t;r+=*t++==i);printf("%d/197",r);}

Try it online!

| improve this answer | |
\$\endgroup\$
3
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Python 3, 46 bytes

print(open(__file__).read().count(input())/46)

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Straightforward enough, reads its own source code, counts how many times the input character appears, and returns that divided by 46 (the length of the code). You can also do it in 42 bytes with

lambda c:open(__file__).read().count(c)/42

but it's a little weird as this isn't a complete program (and since __file__ will give the whole program, if you try to add a f= header, the frequencies get messed up).

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3
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Bash, 30 bytes

echo `tr -dc "$1"<$0|wc -c`/30

Try it online!

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3
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><>, 24 bytes

'3d*0${:}=+40l4)?.+6*,n;

Assumes input on the stack.

  1. Reads the code as a string literal, except for the leading '
  2. 3d* pushes the character code of ', and a counter 0 is also added.
  3. Main loop ${:}=+, increment the counter if the topmost value is equal.
  4. 40l4)?. Exit main loop if all values are read, if not jump back
  5. +6*,n; print the result of floating point division
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  • \$\begingroup\$ It doesn't actually save any bytes, but you can do this to make a couple of no-ops \$\endgroup\$ – Jo King Aug 12 at 11:15
  • \$\begingroup\$ @JoKing Doesn't work on fishlanguage.com. I'm not sure how your code works on tio, since you are jumping to an y of 6 in the code box. \$\endgroup\$ – SE - stop firing the good guys Aug 12 at 11:19
  • \$\begingroup\$ In the reference interpreter, if the y coordinate of the pointer is above the number of lines then it is reset to zero (though . somewhat paradoxically throws an error for negative values) \$\endgroup\$ – Jo King Aug 12 at 11:24
2
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Japt, 18 bytes

øQ¬c"øQ¬cq¹/9"q¹/9

Try it

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2
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Wolfram Language (Mathematica), 46 bytes

StringCount[ToString[#0, InputForm], #1]/46 & 

Try it online! Pure function. Takes a single-character string as input and returns a rational number as output. Note the trailing space, which is necessary for the InputForm string to match the function.

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2
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Lua, 98 bytes

s="s,i,p=s..'s=;load(s)(...)',-1,0while p do i,p=i+1,s:find(...,p+1,1)end print(i/98)"load(s)(...)

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Ported Python answer to Lua.

The problem with Lua string functions is that you can't accept user input for anything but string.find with truthy fourth argument. Anyone trying to golf this should test all magic characters ^$()%.[]*+-? as possible inputs.

Alternatively,

Lua, 84 bytes (reads own source)

s,i,p=io.open(arg[0]):read(),-1,0while p do i,p=i+1,s:find(...,p+1,1)end print(i/84)

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This also assumes that arg[0] can be used as path to program, which most likely is so.

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2
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C (clang), 159 108 90 bytes

x,s;main(c,v)char**v;{for(c=open(__FILE__,0);read(c,&x,1);s+=x==*v[1]);printf("%d/90",s);}

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-51, thanks to ceilingcat (and also without the four-character-filename limitation)

-18, thanks to ceilingcat!

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  • 1
    \$\begingroup\$ By source file, you mean filename, right? \$\endgroup\$ – Calculuswhiz Aug 10 at 20:24
  • 2
    \$\begingroup\$ I think it's allowed but you have to include the file name length in the byte count \$\endgroup\$ – Sanchises Aug 10 at 20:26
  • \$\begingroup\$ @Sanchises Well, given that I don't use the filename for the solution, it just requires it to be that specific length (can be any name), unlike the example here I wouldn't count it. \$\endgroup\$ – Frederik Aug 14 at 17:06
  • \$\begingroup\$ @ceilingcat oh, fantastic, thanks! Didn't know about the char**v-declaration after the function definition, have to look that up. \$\endgroup\$ – Frederik Aug 14 at 17:30
1
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JavaScript (V8), 48 bytes

function f(c){return--(f+'').split(c).length/48}

Try it online!

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1
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Python 3.8 (pre-release), 54 bytes

f=open(__file__).read();print(f.count(input())/len(f))

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__file__ contains the path to the file the program is in. So f opens the file where it is and grabs the contents of it. print(f.count(input())/len(f))

This counts the occurrences of the character provided and divides it by the total number of characters.

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