Multiply two numbers

Question

Input: Two decimal integers. These can be given to the code in standard input, as arguments to the program or function, or as a list.

Output: Their product, as a decimal integer. For example, the input 5 16 would lead to the output 80.

Restrictions: No standard loopholes please. This is code-golf, answer in lowest amount of bytes wins.

Notes: Layout stolen from my earlier challenge, Add two numbers.

Test cases:

1 2   -> 2
4 5   -> 20
7 9   -> 63
-2 8  -> -16
8 -9  -> -72
-8 -9 -> 72
0 8   -> 0
0 -8  -> 0
8 0   -> 0
-8 0  -> 0
0 0   -> 0

Or as CSV:

a,b,c
1,2,2
4,5,20
7,9,63
-2,8,-16
8,-9,-72
-8,-9,72
0,8,0
0,-8,0
8,0,0
-8,0,0
0,0,0

Leaderboard

var QUESTION_ID=106182,OVERRIDE_USER=8478;function answersUrl(e){return"https://api.stackexchange.com/2.2/questions/"+QUESTION_ID+"/answers?page="+e+"&pagesize=100&order=desc&sort=creation&site=codegolf&filter="+ANSWER_FILTER}function commentUrl(e,s){return"https://api.stackexchange.com/2.2/answers/"+s.join(";")+"/comments?page="+e+"&pagesize=100&order=desc&sort=creation&site=codegolf&filter="+COMMENT_FILTER}function getAnswers(){jQuery.ajax({url:answersUrl(answer_page++),method:"get",dataType:"jsonp",crossDomain:!0,success:function(e){answers.push.apply(answers,e.items),answers_hash=[],answer_ids=[],e.items.forEach(function(e){e.comments=[];var s=+e.share_link.match(/\d+/);answer_ids.push(s),answers_hash[s]=e}),e.has_more||(more_answers=!1),comment_page=1,getComments()}})}function getComments(){jQuery.ajax({url:commentUrl(comment_page++,answer_ids),method:"get",dataType:"jsonp",crossDomain:!0,success:function(e){e.items.forEach(function(e){e.owner.user_id===OVERRIDE_USER&&answers_hash[e.post_id].comments.push(e)}),e.has_more?getComments():more_answers?getAnswers():process()}})}function getAuthorName(e){return e.owner.display_name}function process(){var e=[];answers.forEach(function(s){var r=s.body;s.comments.forEach(function(e){OVERRIDE_REG.test(e.body)&&(r="<h1>"+e.body.replace(OVERRIDE_REG,"")+"</h1>")});var a=r.match(SCORE_REG);a&&e.push({user:getAuthorName(s),size:+a[2],language:a[1],link:s.share_link})}),e.sort(function(e,s){var r=e.size,a=s.size;return r-a});var s={},r=1,a=null,n=1;e.forEach(function(e){e.size!=a&&(n=r),a=e.size,++r;var t=jQuery("#answer-template").html();t=t.replace("{{PLACE}}",n+".").replace("{{NAME}}",e.user).replace("{{LANGUAGE}}",e.language).replace("{{SIZE}}",e.size).replace("{{LINK}}",e.link),t=jQuery(t),jQuery("#answers").append(t);var o=e.language;/<a/.test(o)&&(o=jQuery(o).text()),s[o]=s[o]||{lang:e.language,user:e.user,size:e.size,link:e.link}});var t=[];for(var o in s)s.hasOwnProperty(o)&&t.push(s[o]);t.sort(function(e,s){return e.lang>s.lang?1:e.lang<s.lang?-1:0});for(var c=0;c<t.length;++c){var i=jQuery("#language-template").html(),o=t[c];i=i.replace("{{LANGUAGE}}",o.lang).replace("{{NAME}}",o.user).replace("{{SIZE}}",o.size).replace("{{LINK}}",o.link),i=jQuery(i),jQuery("#languages").append(i)}}var ANSWER_FILTER="!t)IWYnsLAZle2tQ3KqrVveCRJfxcRLe",COMMENT_FILTER="!)Q2B_A2kjfAiU78X(md6BoYk",answers=[],answers_hash,answer_ids,answer_page=1,more_answers=!0,comment_page;getAnswers();var SCORE_REG=/<h\d>\s*([^\n,]*[^\s,]),.*?(\d+)(?=[^\n\d<>]*(?:<(?:s>[^\n<>]*<\/s>|[^\n<>]+>)[^\n\d<>]*)*<\/h\d>)/,OVERRIDE_REG=/^Override\s*header:\s*/i;

body{text-align:left!important}#answer-list,#language-list{padding:10px;width:290px;float:left}table thead{font-weight:700}table td{padding:5px}

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@FlipTack That's assuming addition and multiplication are as easy in any language, which I don't know if it's actually true. — Fatalize, Commented Jan 9, 2017 at 8:13
I don't think it's fair to allow the "add two numbers" challenge but close this one. Even though it's very trivial in most programming languages, it's still a valid challenge. If this is too broad, then the "add two numbers" challenge must also be too broad. — user45941, Commented Jan 9, 2017 at 8:42
Anyone is free to downvote trivial challenges if they don't like them, but this is a perfectly valid and on-topic challenge and it's nowhere near "too broad" (if anything, you might call a trivial challenge too narrow). I'm reopening this. That said, if anyone feels that trivial challenges insult their intelligence, I encourage them to seek out languages that make the task less trivial. — Martin Ender, Commented Jan 9, 2017 at 9:19

sergiol · Accepted Answer · 2017-08-01 22:37:33Z

0

Tcl, 10 bytes

expr $a*$b

Try it online!

If one states

namespace path tcl::mathop

before then * acts like a procedure:

Tcl, 7 bytes

* $a $b

Try it online!

answered Aug 1, 2017 at 22:37

sergiol

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

0

QC 4 bytes

QQGN

Requires a newer version which must be compiled manually.

Q Read number from stdin and push to stack
Q Same as above
G Multiply two numbers from stack
N Pop and print number from stack

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Feb 19, 2017 at 12:31

user63331

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peterh · Accepted Answer · 2017-09-13 17:41:19Z

0

[C64, BasicV2], 11 bytes

1rEA,B:?A*B

The input can be given like:

0dA45,45

answered Sep 13, 2017 at 17:41

peterh

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\$\begingroup\$ 0 INPUTA,B:?A*B Note that Commodore BASIC keyword abbreviations doesn't save BASIC bytes, only typing \$\endgroup\$
– Shaun Bebbers
Commented Jan 16, 2018 at 10:30
\$\begingroup\$ @ShaunBebbers As far I know, it is opposite: Basic programs are stored in a tokenized form in the memory, thus even if you write the whole PRINT command, it will be stored as ?. It shows as PRINT only if you LIST it. But it is not very important, because the task is to minimize the code size, not the basic byte size. \$\endgroup\$
– peterh
Commented Jan 16, 2018 at 10:42

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Matheus Avellar · Accepted Answer · 2017-10-07 03:59:38Z

0

Batch File, 23 bytes

@set/ak=%1*%2
@echo %k%

Batch doesn't allow you to print the result of an operation; Thus, we are required to create a temporary variable k which contains the result of the multiplication between argument 1 and 2.

The @'s in front of the commands prevent the current path from being printed before each line on the command prompt.

answered Oct 7, 2017 at 3:59

Matheus Avellar

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Matheus Avellar · Accepted Answer · 2017-10-07 04:42:45Z

0

Falcon, 34 bytes

a=int(input())
b=int(input())
>a*b

Try it online!

Falcon uses a similar syntax to Python. Its output, however, has these awesome aliases called "fast-printing" (as per the documentation):

printl() can be written as >
print() can be written as >>

answered Oct 7, 2017 at 4:42

Matheus Avellar

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Taylor Raine · Accepted Answer · 2017-11-01 20:43:26Z

0

Excel VBA, 8 Bytes

Takes input from cells A1 and B1 and outputs to the VBA immediates window

?[A1*B1]

which is functionally equivalant to

Print ActiveSheet.Range("A1").Value * ActiveSheet.Range("B1").Value

edited Nov 1, 2017 at 20:43

answered Jan 10, 2017 at 17:56

Taylor Raine

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caird coinheringaahin g · Accepted Answer · 2017-12-10 14:14:38Z

0

Verbosity, 392 bytes

Include<Input>
Include<Output>
Include<Integer>
Include<MetaFunctions>
Input:DefineVariable<i; 0>
Output:DefineVariable<o; 0>
Integer:DefineVariable<f; Input:ReadEvaluatedLineFromInput<i>>
Integer:DefineVariable<s; Input:ReadEvaluatedLineFromInput<i>>
Integer:DefineVariable<r; Integer:Product<f; s>>
Output:DisplayAsText<o; r>
DefineMain<> [
MetaFunctions:ExecuteScript<MetaFunctions@FILE>
]

Try it online!

answered Dec 10, 2017 at 14:14

caird coinheringaahin g♦

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caird coinheringaahin g · Accepted Answer · 2017-12-10 14:43:50Z

0

Whispers, 35 bytes

> Input
> Input
>> 1×2
>> Output 3

Try it online!

answered Dec 10, 2017 at 14:43

caird coinheringaahin g♦

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

0

Pyth - 5 bytes

AQ*GH

Explanation:

AQ*GH
A     Set G and H to the first two elements of
 Q    Evaluated input
      Implicitly print
   G  G
  *   Times
    H H

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Dec 11, 2017 at 19:29

Tornado547

1,1631 gold badge7 silver badges13 bronze badges

1

\$\begingroup\$ 3 bytes \$\endgroup\$
– hakr14
Commented Aug 13, 2018 at 3:07

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MD XF · Accepted Answer · 2018-01-15 21:06:50Z

0

Implicit, 1 byte

Implicit input of two integers, multiply them, implicit output. Try it online!

edited Jan 15, 2018 at 21:06

answered Sep 5, 2017 at 23:23

MD XF

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Martin Ender · Accepted Answer · 2018-02-10 20:37:50Z

0

Wumpus, 5 bytes

II*O@

Try it online!

Explanation

Straight-forward and boring:

I   Read the first integer.
I   Read the second integer.
*   Multiply them.
O   Output the result.
@   Terminate the program.

answered Feb 10, 2018 at 20:37

Martin Ender

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Muhammad Salman · Accepted Answer · 2018-04-14 08:57:47Z

0

JavaScript (Node.js), 9 bytes

a=>b=>a*b

Try it online!

answered Apr 14, 2018 at 8:57

Muhammad Salman

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Galen Ivanov · Accepted Answer · 2018-04-16 11:40:31Z

0

Red, 16 bytes

func[a b][a * b]

Try it online!

answered Apr 16, 2018 at 11:40

Galen Ivanov

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

0

T-SQL, 17 bytes

SELECT a*b FROM t

Per our IO rules, SQL can take input from a pre-existing table t with integer columns a and b.

This has the bonus of working on an unlimited* number of provided pairs, if they are included in the input table.

*Well, limited only by SQL storage bounds, which are pretty darn high, using enterprise versions.

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Apr 20, 2018 at 19:43

BradC

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u-ndefined · Accepted Answer · 2018-08-26 12:39:55Z

0

Cubically, 8 7 bytes

$:7$*7%

Explanation:

$        read input
 :7      set notepad to input
   $     read input
    *7   multiply notepad by input
      %  print result

Try it online!

edited Aug 26, 2018 at 12:39

u-ndefined

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answered Aug 1, 2017 at 22:17

MD XF

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Sagittarius · Accepted Answer · 2019-12-24 04:22:04Z

0

Python 3, 14 bytes

lambda x,y:x*y

It's literally just multiplication, lol

answered Dec 24, 2019 at 4:22

Sagittarius

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emanresu A · Accepted Answer · 2022-09-04 07:11:27Z

0

Braingolf, 1 byte

Try it online!

Implicit input, * multiplies the last 2 number on the stack and pushes the result, implicit output.

Here's a slightly more interesting one:

Braingolf, 9 bytes

<2->[.]&+

Try it online!

Implicit input of x and y. Subtracts 2 from x, (because [] is a do-while and we already have one y), then duplicates y x times, finally, sums the entire stack. Implicit output.

edited Sep 4, 2022 at 7:11

emanresu A

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answered Jun 2, 2017 at 8:49

Mayube

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RARE Kpop Manifesto · Accepted Answer · 2023-04-09 23:28:42Z

0

gawk '($_*=$2)_'

The final underscore (..)_ is the most succinct way I could think of to force concat an empty string to the zeros and coerce it into a string in order to print it without using the print statement.

weak typing in awk is advantageous cuz I never defined _, so 1st one is used as numeric zero while 2nd one acts as empty string.

answered Apr 9, 2023 at 23:28

RARE Kpop Manifesto

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ATaco · Accepted Answer · 2023-04-11 22:22:38Z

0

ARBLE, 3 bytes

a*b

Similar to the answer for Adding two numbers.

Try it online!

answered Apr 11, 2023 at 22:22

ATaco

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Kai Burghardt · Accepted Answer · 2023-05-13 11:35:06Z

HP‑41C series, 7 B

Input is to be placed in the X and Y stack registers.

01♦LBL⸆P           5 Bytes  global label requires 4 + (length of string) Bytes
02 ∗               1 Byte   X ≔ Y × X
03 RTN             1 Byte   `RTN` does not affect local label search

Some other (longer) methods:

stack arithmetic:
```
ST∗ Y            2 Bytes  Rₙ ≔ Rₙ × X
```
Result is in Y now. Necessary keystrokes: STO × . × (for the letter Y).

statistics functions:

CLΣ              1 Byte   clear statistics registers
Σ+               1 Byte   accumulate statistics values

If ΣREG? = 11 (the default), result is in R₁₅.

Furthermore, there’s % (1 Byte), but it will require scaling the result back by a factor of 100.

The Thonnu · Accepted Answer · 2023-05-28 18:53:45Z

0

Thunno 2, 1 byte

×

Attempt This Online!

No, * is exponentiation, not multiplication.

answered May 28, 2023 at 18:53

The Thonnu

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Dadsdy · Accepted Answer · 2023-05-29 16:22:28Z

0

Desmoslang Assembly, 5 Bytes

I*IOT

answered May 29, 2023 at 16:22

Dadsdy

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ATaco · Accepted Answer · 2023-10-01 22:06:51Z

ReRegex, 58 bytes

#import math
-(.*?)-/$1/(.+)-/-$1/(\d*)x(\d*)/$1*$2/#input

Try it online!

Ungolfed

#import math
-(.*?)-/$1/#		# Remove pairs of -
(.+)-/-$1/#		# Move any - to the start of the text
(\d*)x(\d*)/$1*$2/#	# Take the input of (number)x(number) and convert it to (number)*(number), implicitly multiplying.
#input

Slightly more interesting, 81 bytes

-(.*?)-/$1/(.+)-/-$1/(?<![:_])(_*)x(_*)/:$1x$2/:(_*)x(_*)_/$1:$1x$2/:_*x$//#input

Try it online!

Ungolfed

-(.*?)-/$1/#			# Remove pairs of -
(.+)-/-$1/#			# Move any - to the start of the text
(?<![:_])(_*)x(_*)/:$1x$2/#	# Add a : if there isn't one, to keep track of the output
:(_*)x(_*)_/$1:$1x$2/#		# Whilst the second argument is > 0, remove one from it, and copy the first argument to the output
:_*x$//#			# When the second argument is zero, remove all the supporting stuff, leaving just the output
#input

marmeladze · Accepted Answer · 2017-05-16 10:26:01Z

-2

Ruby, 10 bytes

->a,b{a*b}

and it would be great to learn if it is possible with fewer bytes

answered May 16, 2017 at 10:26

marmeladze

2273 silver badges8 bronze badges

\$\begingroup\$ codegolf.stackexchange.com/a/106314/53551 \$\endgroup\$
– anna328p
Commented May 16, 2017 at 17:46
\$\begingroup\$ haven't seen that \$\endgroup\$
– marmeladze
Commented May 16, 2017 at 18:46
\$\begingroup\$ should I supposed to delete/change on such cases? as you see, i am new here, and do not know, "rules of fight club" -)) \$\endgroup\$
– marmeladze
Commented May 16, 2017 at 19:30
\$\begingroup\$ Ask in chat chat.stackexchange.com/rooms/240/the-nineteenth-byte \$\endgroup\$
– anna328p
Commented May 16, 2017 at 19:31
2

\$\begingroup\$ Duplicate answers are allowed, though they might attract downvotes. \$\endgroup\$
– hyperneutrino ♦
Commented Oct 6, 2017 at 20:51

Add a comment |

Stack Exchange Network

Multiply two numbers

Leaderboard

144 Answers 144

Tcl, 10 bytes

Tcl, 7 bytes

QC 4 bytes

[C64, BasicV2], 11 bytes

Batch File, 23 bytes

Falcon, 34 bytes

Excel VBA, 8 Bytes

Verbosity, 392 bytes

Whispers, 35 bytes

Pyth - 5 bytes

Implicit, 1 byte

Wumpus, 5 bytes

Explanation

JavaScript (Node.js), 9 bytes

Red, 16 bytes

T-SQL, 17 bytes

Cubically, 8 7 bytes

Python 3, 14 bytes

Braingolf, 1 byte

Braingolf, 9 bytes

ARBLE, 3 bytes

HP‑41C series, 7 B

Thunno 2, 1 byte

Desmoslang Assembly, 5 Bytes

ReRegex, 58 bytes

Ungolfed

Slightly more interesting, 81 bytes

Ungolfed

Ruby, 10 bytes

Your Answer

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code-golf
math
number
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Multiply two numbers

Leaderboard

144 Answers 144

Tcl, 10 bytes

Tcl, 7 bytes

QC 4 bytes

[C64, BasicV2], 11 bytes

Batch File, 23 bytes

Falcon, 34 bytes

Excel VBA, 8 Bytes

Verbosity, 392 bytes

Whispers, 35 bytes

Pyth - 5 bytes

Implicit, 1 byte

Wumpus, 5 bytes

Explanation

JavaScript (Node.js), 9 bytes

Red, 16 bytes

T-SQL, 17 bytes

Cubically, 8 7 bytes

Python 3, 14 bytes

Braingolf, 1 byte

Braingolf, 9 bytes

ARBLE, 3 bytes

HP‑41C series, 7 B

Thunno 2, 1 byte

Desmoslang Assembly, 5 Bytes

ReRegex, 58 bytes

Ungolfed

Slightly more interesting, 81 bytes

Ungolfed

Ruby, 10 bytes

Your Answer

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Not the answer you're looking for? Browse other questions tagged
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