Stay away from zero

Question

Task

Given a non-negative integer n, output 1 if n is 0, and output the value of n otherwise.

Input

A non-negative integer.

If you would like to accept the string as input, the string would match the following regex: /^(0|[1-9][0-9]*)$/, i.e. it must not have any leading zeroes, except when it is 0.
If you accept a real integer as input, you may assume that the integer is within the handling capability of the language.

Output

A positive integer, specified above. Leading zeroes are not allowed. Your output should match the regex /^[1-9][0-9]*$/.

Testcases

input output
    0      1
    1      1
    2      2
    3      3
    4      4
    5      5
    6      6
    7      7

Scoring

This is code-golf, so shortest answer in bytes wins.

Standard loopholes apply.

You should probably put a link to the TNB CMC, since that's where this challenge came from. — mbomb007, Commented May 3, 2017 at 20:53
Does the answer need to be a full function, or can it be the body? — Caleb Kleveter, Commented May 3, 2017 at 20:58
@CalebKleveter The default rule in PPCG is that the answer is either a function or a full program, but not snippets. — Leaky Nun, Commented May 4, 2017 at 1:56

DanTheMan · Accepted Answer · 2024-01-04 19:40:45Z

2

Desmos, 10 bytes

Improvement suggested by Aiden Chow.

f(x)=0^x+x

Previous 13-byte solution:

f(x)=max(1,x)

Try it here

edited Jan 4 at 19:40

answered May 4, 2017 at 1:26

DanTheMan

4,11516 silver badges41 bronze badges

\$\begingroup\$ Desmos tips: you can have lists of integers like this. \$\endgroup\$
– Leaky Nun
Commented May 4, 2017 at 1:58
1

\$\begingroup\$ 10 bytes: f(x)=0^x+x. This works because 0^0 equals 1 in Desmos. \$\endgroup\$
– Aiden Chow
Commented Dec 30, 2023 at 8:15
\$\begingroup\$ @AidenChow That's wild. Thanks for letting me know! \$\endgroup\$
– DanTheMan
Commented Jan 4 at 19:38
1

\$\begingroup\$ Yea, this 0^x+x trick is actually used to avoid log(0) situations when trying to count the digits of a number. floor(logn)+1 (where n is the number we are trying to get the digits of) works if n is positive, but the shortest way to cover the n=0 case seems to be floor(log(0^n+n))+1. \$\endgroup\$
– Aiden Chow
Commented Jan 4 at 22:12

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

C, 27 Bytes

f(n){printf("%d\n",n?n:1);}

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered May 2, 2017 at 16:41

cleblanc

3,48010 silver badges16 bronze badges

\$\begingroup\$ You don't have to output, you can return that too. Also in GCC, you can do n?:1. \$\endgroup\$
– betseg
Commented May 2, 2017 at 16:47
\$\begingroup\$ @betseg thanks I like that n?:1 trick \$\endgroup\$
– cleblanc
Commented May 2, 2017 at 16:50
\$\begingroup\$ In this particular case you can also use n||1 which is compiler-independent, or !n+n as seen in several other answers. :) \$\endgroup\$
– fluffy
Commented May 3, 2017 at 1:48

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Luis Mendo · Accepted Answer · 2017-05-02 16:45:32Z

1

MATL, 3 bytes

t~+

Try it online!

Explanation

t   % Implicit inupt. Duplicate
~   % Logical negation. Converts zero to 1, and nonzero to 0
+   % Add. Implicit display

answered May 2, 2017 at 16:45

Luis Mendo

105k9 gold badges135 silver badges372 bronze badges

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sporkl · Accepted Answer · 2017-05-02 17:08:06Z

1

///, 11 bytes

/#0/1//#//#

Try it online!

Since there is no other way to take input in ///, hard-code the input after the last #.

Works by replacing #0 with 1. Then it removes any remaining #. The # makes sure that an input of 10 would not output 11.

Version that takes input in Itflabtijtslwi:

GGaGGGGbGG/#0/1//#//#ab

Try it online!

answered May 2, 2017 at 17:08

sporkl

6,9241 gold badge27 silver badges63 bronze badges

\$\begingroup\$ For your second program, the input has to be less than 100. Maybe you should mention this? \$\endgroup\$
– boboquack
Commented May 3, 2017 at 9:57
\$\begingroup\$ @boboquack Yes. \$\endgroup\$
– sporkl
Commented May 3, 2017 at 12:05

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Robert Benson · Accepted Answer · 2017-05-02 17:12:33Z

1

AWK, 10 bytes

!$0{$0=1}1

Try it online!

Example Usage:

awk '!$0{$0=1}1' <<< 978

answered May 2, 2017 at 17:12

Robert Benson

1,63711 silver badges13 bronze badges

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

Universal lambda, 3 bytes (17 bits)

00010110001100010

It is a function and not a complete program. I think it should work, but didn't actually test it because it doesn't seem easy to do so. It means λx.x(λy.x)(λy.y).

Lazy K, 10 bytes

S(SIK)(KI)

It is a function, untested, too.

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered May 2, 2017 at 18:40

jimmy23013

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osuka_ · Accepted Answer · 2017-05-02 18:56:45Z

1

05AB1E, 7 bytes

D0›i,}1

Try it online!

D           //push two inputs (implicit)
 0›         //push input greater than zero
   i        //if true
    ,}      //print input
      1     //push 1. printing is implicit if there is no previous output

edited May 2, 2017 at 18:56

answered May 2, 2017 at 18:55

osuka_

4312 silver badges9 bronze badges

\$\begingroup\$ I'm sure there is a much shorter way to do this... \$\endgroup\$
– Leaky Nun
Commented May 2, 2017 at 18:56
\$\begingroup\$ Me too, but I can't actually work 05ab1e, so... \$\endgroup\$
– osuka_
Commented May 2, 2017 at 18:57
\$\begingroup\$ You could save 3 bytes with D_i1. \$\endgroup\$
– Emigna
Commented May 2, 2017 at 20:25
3

\$\begingroup\$ Or in two bytes: $M. \$\endgroup\$
– Adnan
Commented May 2, 2017 at 21:51

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MegaTom · Accepted Answer · 2017-05-02 19:19:27Z

1

Brain-Flak, 14 bytes

((){{}[()]}{})

Try it online!

Just computes: 1 + (n ? n-1 : 0).

edited May 2, 2017 at 19:19

answered May 2, 2017 at 19:09

MegaTom

4,2861 gold badge21 silver badges24 bronze badges

\$\begingroup\$ Challenge accepted :) \$\endgroup\$
– DJMcMayhem
Commented May 3, 2017 at 21:08

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

Ohm, 11 6 bytes

ö?┼¿1;

Uses CP-437 character encoding. Run with -c flag

Explanation:

ö?┼¿1;
       ■print(                                            )
  ┼    ■      first_input()
 ?   ; ■                   if(                     )
ö      ■                      int(first_input())!=0
   ¿   ■                                            else 
    1  ■                                                 1

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered May 2, 2017 at 17:09

Linnea Gräf

3,05916 silver badges35 bronze badges

\$\begingroup\$ Here's a list of things you could fix: (1) if you just say this is in CP437 (no need for the -c flag), you only need to count characters. (2) Ohm is written in Ruby, so 0 is a truthy value. However, there is a built-in x != 0 component (ö). (3) There is implicit printing, so , is not necessary. (4) Ohm is on TIO now, so it'd help if you added a link to it. \$\endgroup\$
– Nick Clifford
Commented May 2, 2017 at 19:57
\$\begingroup\$ FYI, feel free to ping me in chat if you have any questions about/feature reqs for the language! \$\endgroup\$
– Nick Clifford
Commented May 2, 2017 at 20:11
\$\begingroup\$ Again, there's no need for the -c flag. That's just for reading files; it's not necessary for PPCG submissions. Just say it's in CP437 and you're good. \$\endgroup\$
– Nick Clifford
Commented May 2, 2017 at 20:36

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Khaled.K · Accepted Answer · 2017-05-02 21:26:04Z

1

Java, 29 bytes

Try Online

int f(int n){return n<1?1:n;}

answered May 2, 2017 at 21:26

Khaled.K

1,48710 silver badges12 bronze badges

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Oliver · Accepted Answer · 2017-05-03 01:53:47Z

1

Japt, 2 bytes

w1

Try it online!

Returns the larger of 1 and the input.

answered May 3, 2017 at 1:53

Oliver

7,9022 gold badges18 silver badges38 bronze badges

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

C++, 22 bytes

[](int i){return!i+i;}

Try it online

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered May 3, 2017 at 6:22

jdt

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pajonk · Accepted Answer · 2017-05-03 08:44:44Z

1

Excel, 10 bytes

=MAX(A1,1)

Here's another 10-byte solution: link

answered May 3, 2017 at 8:44

pajonk

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Brian · Accepted Answer · 2017-05-03 09:30:46Z

1

SpecBAS - 20 bytes

1 INPUT n: ?n OR n=0

? is shorthand for PRINT

answered May 3, 2017 at 9:30

Brian

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TheLethalCoder · Accepted Answer · 2017-05-03 09:32:47Z

1

C#, 11 bytes

n=>n<1?1:n;

This compiles to a Func<int, int>.

edited May 3, 2017 at 9:32

answered May 3, 2017 at 9:25

TheLethalCoder

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

Starry, 14 bytes

, +'      +*`.

Try it online!

Explanation

Space shown as _ .

,           Read integer and push to stack
_+          Duplicate
'           If non-zero jump to branch label
______+     Push 1
*           Add
`           Mark branch label
.           Print as a number

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered May 2, 2017 at 23:10

Luis Mendo

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\$\begingroup\$ My first Starry answer \$\endgroup\$
– Luis Mendo
Commented May 2, 2017 at 23:10

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mark · Accepted Answer · 2017-05-03 13:42:46Z

1

Clojure, 12 bytes

#(get[1]% %)

The get function takes an associative data structure, a key, and a default value. Vectors are associative using sequential position as the key. So, [1] is a vector with the value 1 at position 0. If get is called with parameter 0 it will return 1, otherwise no other keys exist in the vector so it returns the default value of the parameter.

edited May 3, 2017 at 13:42

answered May 2, 2017 at 17:35

mark

2711 silver badge3 bronze badges

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gacelita · Accepted Answer · 2017-05-04 14:41:54Z

1

Clojure, 10 bytes

#(max 1%)

Not much to explain.

edited May 4, 2017 at 14:41

answered May 4, 2017 at 13:54

gacelita

112 bronze badges

\$\begingroup\$ I think you can shorten this to #(max 1%) (9 bytes). tio.run/nexus/… \$\endgroup\$
– Dennis
Commented May 4, 2017 at 14:37

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eaglgenes101 · Accepted Answer · 2017-05-10 01:08:49Z

1

Julia, 13 12 bytes

f(n)=n<1?1:n

~~Unfortunately, Julia doesn't do implicit casting from int to bool, so I have to burn an entire 3 characters just to do a comparison to zero.~~ Saved one byte by safely assuming the number isn't negative. Still too verbose for my taste, though.

edited May 10, 2017 at 1:08

answered May 10, 2017 at 1:02

eaglgenes101

6776 silver badges11 bronze badges

\$\begingroup\$ You can post the answer as an anonymous function and save 2 bytes, n->n<1?1:n Try it online! \$\endgroup\$
– Sundar R
Commented Aug 12, 2018 at 21:16

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

Groovy, 7 bytes

{it?:1}

Elvis operator; if true, return self, else return 1. Only false integer value auto-unboxxed to false in Groovy is 0. Thusly, exactly the spec.

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Aug 1, 2017 at 21:19

Magic Octopus Urn

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FlipTack · Accepted Answer · 2017-12-17 12:32:06Z

1

Symbolic Python, 11 bytes

_+=_==(_>_)

Try it online!

_+=           # Output = Input +
   _==(_>_)                       Input == 0

answered Dec 17, 2017 at 12:32

FlipTack

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

Google Sheets, 9 Bytes

Anonymous worksheet function that takes input from range A1 and outputs to the calling cell

=Max(1,A1

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Dec 27, 2017 at 0:01

Taylor Raine

8,7462 gold badges27 silver badges51 bronze badges

\$\begingroup\$ This look very cool mate :) \$\endgroup\$
– NTCG
Commented Jan 4, 2018 at 8:07

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

Bash, 43 bytes

if [ $1 -eq 0 ];then echo 1;else echo $1;fi

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Jan 4, 2018 at 8:06

NTCG

1518 bronze badges

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

Python 21 Bytes

int(max('1',input()))

Takes input from REPL environment

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered May 10, 2017 at 4:12

tgabb

1111 bronze badge

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L3viathan · Accepted Answer · 2018-01-05 15:14:46Z

1

Aceto, 9 8 bytes

rid0=`1p

read an integer and duplicate it, then push 0. Are they =? Then (`) push a 1. print the top element.

edited Jan 5, 2018 at 15:14

answered May 9, 2017 at 23:50

L3viathan

3,41115 silver badges25 bronze badges

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

PowerShell, 24 22 17 Bytes

blatantly stolen from here

!($a=$args[0])+$a

Explanation

Invert the value, returning 0 for non-0 numbers, and 1 for 0, then add the intitial to it.

this makes it basically 1/0 + value, so for 0 the first value is 1, any other numbers it's 0.

examples:
# !0+0 = 1
# !1+1 = 1
# !9+9 = 9

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered May 2, 2017 at 16:58

colsw

3,3673 gold badges14 silver badges24 bronze badges

1

\$\begingroup\$ Could you instead use !$a as your index check? You wouldn't be able to set $a in your current manner, but I think something like this would work? Try it online! \$\endgroup\$
– Sinusoid
Commented May 2, 2017 at 21:13
1

\$\begingroup\$ @Sinusoid that worked perfectly for -2, but turns out the C answer was a bit ahead of us both, didn't think of the method at all. \$\endgroup\$
– colsw
Commented May 3, 2017 at 9:46
\$\begingroup\$ That is certainly interesting! I will need to keep this method in mind :P \$\endgroup\$
– Sinusoid
Commented May 3, 2017 at 13:21

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Phlarx · Accepted Answer · 2018-01-17 17:06:15Z

Chip, 20 18 bytes

eaABb
*`\\-!
fcCDd

Try it online!

How?

 aABb
            Copy the low 4 bits from input to output
 cCDd

e
*           Set the higher bits of output, so that the values are ASCII digits
f

eaABb
*           Replicate any ASCII digits on input to output
fcCDd

            -
     !      Produce a high signal, but only during the first byte
            -

 aAB
 `\\-*      Set the lowest bit of output, if the four low bits of input are unset
  CD

 aAB        Set the lowest bit of output, if the four low bits
 `\\-!      of input are unset, and only on the first byte
  CD

gggg · Accepted Answer · 2018-01-17 17:35:16Z

1

Julia 0.6, 10 bytes

x->x<1?1:x

Try it online!

answered Jan 17, 2018 at 17:35

gggg

2,01511 silver badges9 bronze badges

1

\$\begingroup\$ also 10 bytes: x->x+(x<1) \$\endgroup\$
– Giuseppe
Commented Jan 17, 2018 at 19:03

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Giuseppe · Accepted Answer · 2018-01-17 19:30:43Z

1

SNOBOL4 (CSNOBOL4), 49 47 36 bytes

	N =INPUT
	N =EQ(N) 1
	OUTPUT =N
END

Try it online!

edited Jan 17, 2018 at 19:30

answered Dec 15, 2017 at 18:40

Giuseppe

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Community · Accepted Answer · 2020-06-17 09:04:33Z

1

><>, 6 bytes

:?!1n;

Could have been 1 byte shorter if ? had the opposite conditional behaviour.

:?       check if nonzero, then either
  !      a) skip the next instruction or
   1     b) push 1 to the stack
    n    print
     ;   terminate

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Apr 12, 2018 at 21:15

SE - stop firing the good guys

2,11916 silver badges20 bronze badges

\$\begingroup\$ Take the input via the -v flag instead. It saves a byte, and it's less suspect than using the char code of a character \$\endgroup\$
– Jo King ♦
Commented Apr 13, 2018 at 8:17
\$\begingroup\$ 5 bytes \$\endgroup\$
– Jo King ♦
Commented Apr 13, 2018 at 10:34
\$\begingroup\$ Terminating with an error wasn't legal when I used to be around. \$\endgroup\$
– SE - stop firing the good guys
Commented Apr 13, 2018 at 12:14

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Stay away from zero

Task

Input

Output

Testcases

Scoring

164 Answers 164

Desmos, 10 bytes

C, 27 Bytes

MATL, 3 bytes

Explanation

///, 11 bytes

AWK, 10 bytes

Universal lambda, 3 bytes (17 bits)

Lazy K, 10 bytes

05AB1E, 7 bytes

Brain-Flak, 14 bytes

Ohm, 11 6 bytes

Java, 29 bytes

Japt, 2 bytes

C++, 22 bytes

Excel, 10 bytes

SpecBAS - 20 bytes

C#, 11 bytes

Starry, 14 bytes

Explanation

Clojure, 12 bytes

Clojure, 10 bytes

Julia, 13 12 bytes

Groovy, 7 bytes

Symbolic Python, 11 bytes

Google Sheets, 9 Bytes

Bash, 43 bytes

Python 21 Bytes

Aceto, 9 8 bytes

PowerShell, 24 22 17 Bytes

blatantly stolen from here

Chip, 20 18 bytes

How?

Julia 0.6, 10 bytes

SNOBOL4 (CSNOBOL4), 49 47 36 bytes

><>, 6 bytes

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