Test if two numbers are equal

Question

Challenge

Input two integers.
- Integer I/O must be decimal.
If the integers are equal, output a truthy value.
Otherwise, output a falsy value.

Clarifications

You will never receive non-integer inputs.
You will never receive an input that is outside the bounds [-2³¹, 2³¹).

Rules

Standard loopholes are disallowed.
This is code-golf. Shortest answer wins, but will not be selected.

I can't tell you the reason for the other downvotes, but mine is because I firmly believe that trivial questions like this are bad for the site. -- Peter Taylor — DJMcMayhem♦, May 31 '17 at 20:29
A reminder: as this is ridiculously trivial in most languages, please vote according to difficulty. Just because it's a 1 byte builtin in some golfing languages doesn't mean those answers are better than well-golfed longer solutions in, say, Brain-Flak. — Rɪᴋᴇʀ, May 31 '17 at 20:33
@All downvoters: If you're downvoting this then you have to downvote the add two numbers challenge and the multiply two numbers challenge too because they're "too trivial". — CalculatorFeline, May 31 '17 at 21:01
@CalculatorFeline But not all trivial challenges are the same level of trivial. In most languages without built-ins to add two numbers or check for equality (especially those without numerical input), I would expect the equality check to be easier to implement. Example: my BF equality check is 45 bytes, while the shortest BF addition program is 224 bytes. — ETHproductions, May 31 '17 at 21:10
So are you trying to rule out a C function like int f(int a, int b){ return a==b;}? Because int in C represents numbers with base-2 bit-patterns, not decimal. (The details are implementation-defined, but there are enough requirements in the C standard that I don't think an implementation could legally choose a BCD (binary-coded-decimal) representation. At least not for unsigned char.) I think you're getting mixed up by source code that looks like int a = 1234;. That uses a decimal representation in the source, but not in the program. int a=0x4d2; is identical to 1234. — Peter Cordes, Jan 10 '18 at 4:20

Brad Gilbert b2gills · Accepted Answer · 2017-05-31 23:48:01Z

1

Perl 6, 4 bytes

*==*

Try it

This creates a WhateverCode lambda, Each * represents a parameter

answered May 31 '17 at 23:48

Brad Gilbert b2gills

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Skidsdev · Accepted Answer · 2017-06-01 08:06:07Z

Braingolf, 4 bytes

e1:0

Outputs 1 if inputs are equal, otherwise 0

Explanation:

e1:0  Implicit input to stack
e     If last 2 items are equal..
 1    ..push 1 to stack
  :   else
   0  ..push 0 to stack
      Implicit endif
      Implicit output of last item on stack

Spikatrix · Accepted Answer · 2017-06-01 10:29:59Z

1

C, 20 bytes

f(a,b){return a==b;}

answered Jun 1 '17 at 10:29

Spikatrix

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Felipe Nardi Batista · Accepted Answer · 2017-06-01 13:53:19Z

1

Lua, 18 bytes

a,b=...print(a==b)

Try it online!

answered Jun 1 '17 at 13:53

Felipe Nardi Batista

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Skidsdev · Accepted Answer · 2017-06-02 15:21:22Z

09D, 13 bytes

310310412D301

Outputs 1 if the values are equal, otherwise 0

Explanation:

310310412D301
3                 Read..
 1                ..from I/O (STDIN)
  0               ..to stack
   310            Read 2nd input as above
      4           Apply math function...
       12D        ..isEqual, pop both items and push a 1
                     if they are equal, otherwise push a 0
          3       Read..
           0      ..from stack
            1     ..to I/O (STDOUT)

Mas · Accepted Answer · 2017-06-02 17:56:52Z

1

Java, 41 36 12 bytes

-4 bytes thanks to @totallyhuman - Changed floats to ints

-1 byte by removing space between second method argument and comma.

-24 by converting the whole program to a lambda (woo).

(i,j)->i==j;

Takes the form of a java.util.function.BiFunction< Boolean, Integer, Integer > using an expression lambda.

edited Jun 2 '17 at 17:56

answered May 31 '17 at 20:24

Mas

1514 bronze badges

1

\$\begingroup\$ @totallyhuman Thanks! Got a bit confused since the description said "2 decimal integers" \$\endgroup\$ – Mas May 31 '17 at 22:34
\$\begingroup\$ float isn't decimal either; it's IEEE binary32. "decimal" is a stupid way of describing binary integers. It only makes sense when talking about their string representation, or with decimal floating point (en.wikipedia.org/wiki/Decimal_floating_point), which isn't provided in hardware by most FPUs. IIRC, IBM's POWER architecture has decimal float support, which is useful for some financial stuff. \$\endgroup\$ – Peter Cordes Jan 10 '18 at 2:06

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MD XF · Accepted Answer · 2017-06-14 16:09:48Z

1

Triangular, 6 bytes

$.$%=<

Try it online!

Formats into this triangle:

  $
 . $
% = <

Commands executed (without no-ops or directionals): $$=%

Pretty simple.

$ - read input as integer
= - compare top two stack values for equality
% - print result

answered Jun 14 '17 at 16:09

MD XF

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MD XF · Accepted Answer · 2017-06-25 04:16:00Z

1

Decimal, 13 bytes

81D81D412D301

Pretty simple. Ungolfed:

81D  ; builtin - read INT to stack
81D  ; builtin - read INT to stack
412D ; compare for equality
301  ; print to STDOUT

Try it online!

edited Jun 25 '17 at 4:16

answered Jun 5 '17 at 2:31

MD XF

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Felipe Nardi Batista · Accepted Answer · 2017-10-26 13:08:32Z

1

dc, 12 9 bytes

[1]sF=F0+

Try it online!

edited Oct 26 '17 at 13:08

answered May 31 '17 at 21:42

Felipe Nardi Batista

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caird coinheringaahing · Accepted Answer · 2017-12-13 00:21:28Z

1

Add++, 3 bytes

L,=

Try it online!

Yay for lambda functions!

edited Dec 13 '17 at 0:21

answered Jun 2 '17 at 20:39

caird coinheringaahing

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Mr. Xcoder · Accepted Answer · 2018-01-06 16:35:20Z

1

Triangularity, 17 bytes

..)..
.I)1.
I=...

Try it online!

Triangularity, 17 bytes

..)..
.D@I.
sI=..

Try it online!

answered Jan 6 '18 at 16:35

Mr. Xcoder

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Beta Decay · Accepted Answer · 2018-01-07 11:08:41Z

1

Noether, 4 bytes

II=P

Try it online!

answered Jan 7 '18 at 11:08

Beta Decay

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MD XF · Accepted Answer · 2018-01-15 21:10:00Z

1

Cubically, 8 5 bytes

$:$=%

Explanation:

$      read integer input
 :     set notepad to input
  $    read integer input
   =   compare notepad to input
    %  print notepad

Try it online!

edited Jan 15 '18 at 21:10

answered Aug 2 '17 at 2:35

MD XF

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Kevin Cruijssen · Accepted Answer · 2018-11-12 16:18:09Z

Whitespace, 60 bytes

[S S S N
_Push_0][S N
S _Duplicate_0][S N
S _Duplicate_0][T   N
T   T   _Read_STDIN_as_integer][T   T   T   _Retrieve][S S S T  N
_Push_1][S N
S _Duplicate_1][T   N
T   T   _Read_STDIN_as_integer][T   T   T   _Retrieve][T    S S T   _Subtract][N
T   S N
_If_0_Jump_to_Label_EQUAL][T    N
S T _Print_as_integer][N
N
N
_Exit_program][N
S S N
_Create_Label_EQUAL][S S S T    N
_Push_1][T  N
S T _Print_as_integer]

Letters S (space), T (tab), and N (new-line) added as highlighting only.
[..._some_action] added as explanation only.

Try it online (with raw spaces, tabs and new-lines only).

Outputs 1/0 as truthy/falsey values. 3 bytes could be saved by removing NNN if 1/01 as truthy/falsey values are allowed.

Pseudo-code:

Integer i = STDIN as number
Integer j = STDIN as number
If(i == j):
  Call function EQUAL()
Print 0 to STDOUT
Exit program

function EQUAL:
  Print 1 to STDOUT
  Exit automatically with error

MilkyWay90 · Accepted Answer · 2018-12-02 04:59:57Z

1

Python 2 - 15 bytes

lambda a,b:a==b

Like this:

def equality(a, b): Declare a function
    return a == b   Return True if equal, False if not

answered Dec 2 '18 at 4:59

MilkyWay90

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Timtech · Accepted Answer · 2018-12-05 16:19:40Z

1

TI-Basic, 3 bytes

not(variance(Ans

Gives {1} as truthy value or {0} for falsy. -1 bytes thanks to lirtosiast!

edited Dec 5 '18 at 16:19

answered May 18 '18 at 4:06

Timtech

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\$\begingroup\$ not(variance(Ans \$\endgroup\$ – lirtosiast Nov 24 '18 at 4:09
\$\begingroup\$ @lirtosiast Good tip, thanks! \$\endgroup\$ – Timtech Dec 5 '18 at 16:19

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Gabriel Mills · Accepted Answer · 2019-01-20 22:20:34Z

1

PowerShell, 36 20 bytes

-16 bytes thanks to @mazzy (Basically their answer!)

!($args[0]-$args[1])

Try it online!

Simple. Takes arguments from commandline arguments.

edited Jan 20 at 22:20

answered Dec 2 '18 at 19:33

Gabriel Mills

6733 silver badges13 bronze badges

\$\begingroup\$ I don't know much about powershell, but aren't you using more bytes to shorten $args to $a than you would be if you just wrote $args twice? \$\endgroup\$ – dkudriavtsev Dec 3 '18 at 4:43
\$\begingroup\$ Great! Gabriel Mills, try this !($args[0]-$args[1]) or $a,$b=$args;!($a-$b) or param($a,$b)!($a-$b) \$\endgroup\$ – mazzy Dec 3 '18 at 5:40

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A _ · Accepted Answer · 2019-09-17 23:20:41Z

1

Keg, 3 bytes(SBCS on Keg wiki)

¿¿=

Explanation:

¿¿#  Two integer inputs
  =# Test whether they are equal

answered Sep 17 at 23:20

A _

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ceilingcat · Accepted Answer · 2018-01-06 21:33:15Z

0

x86_64 machine language on Linux, 8 bytes

0:   31 c0                   xor    %eax,%eax
2:   39 f7                   cmp    %esi,%edi
4:   0f 94 c0                sete   %al
7:   c3                      retq

Try it online!

answered Jan 6 '18 at 21:33

ceilingcat

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\$\begingroup\$ Why are you bothering to return a 64 or 32-bit integer truth value? The x86-64 SysV calling convention (used on Linux) only requires bool return values to be in the low 8 bits; the remaining bits of rax are allowed to hold garbage. The only reason you (or gcc) would xor-zero eax would be for performance reasons to avoid a potential false dependency. \$\endgroup\$ – Peter Cordes Jan 9 '18 at 13:24
\$\begingroup\$ In assembly language, you should choose your calling convention to optimize for the problem. For example, you should return the compare result in ZF (so ZF=1 means equal). Then the whole function is only 4 bytes. \$\endgroup\$ – Peter Cordes Jan 9 '18 at 13:26

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squid · Accepted Answer · 2019-04-25 11:52:43Z

0

><>, 3 bytes

=n;

Try it online!

Takes command line arguments.
I feel unclean posting an answer to this one..

answered Apr 25 at 11:52

squid

1,1211 silver badge11 bronze badges

1

\$\begingroup\$ Random post: You have 1111 reps now! \$\endgroup\$ – HighlyRadioactive Sep 27 at 4:50
\$\begingroup\$ And 1 silver badge, and 11 bronze badges! Gotta say, it really disincentivizes further activity. xD \$\endgroup\$ – squid Sep 27 at 11:15
\$\begingroup\$ If only you program with 1+... (Sorry for 1+-promoting) \$\endgroup\$ – HighlyRadioactive Sep 27 at 11:20
\$\begingroup\$ Also, you can't stop people from upvoting your awesome answers! (I won't upvote this answer despite it being awesome and written in one of my favorite answer, though, to preserve 1,111) \$\endgroup\$ – HighlyRadioactive Sep 27 at 13:21
\$\begingroup\$ I now have 666 reps... \$\endgroup\$ – HighlyRadioactive Sep 27 at 13:21

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Skidsdev · Accepted Answer · 2019-05-02 18:47:35Z

0

Clam, 5 4 bytes

p:rr

Explanation

p    - Print...
  r  - Next input
 :   - Equal to
   r - Next input

edited May 2 at 18:47

answered May 2 at 18:38

Skidsdev

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JL2210 · Accepted Answer · 2019-09-17 21:26:17Z

0

C, 19 bytes

f(a,b){return a-b;}

Try it online!

C, 18 bytes

#define f(a,b) a-b

Try it online!

"Truthy" value is 0 and "Falsy" value is anything but.

answered Sep 17 at 21:26

JL2210

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A _ · Accepted Answer · 2019-09-26 23:35:10Z

0

Caboose, 24 bytes

print(input()==input());

TIO

answered Sep 26 at 23:35

A _

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HighlyRadioactive · Accepted Answer · 2019-09-27 05:17:47Z

1+, 10 bytes

."."\</<*:

This is likely to be ungolfed: tell me if there's a better approach.

Explanation:

First, I'll name the two input A and B.

."." pushes A, duplicate it, pushes B, duplicate it. So now the stack is: A A B B.

\ rotates the stack, so the stack is now B A A B.

</<* Pushes A <= B, move it to the bottom of the stack, and pushes B <= A, then multiply them, as they are both boolean, this is equivalent to the and operation.

: Outputs the result.

Test if two numbers are equal

Challenge

Clarifications

Rules

54 Answers 54

Perl 6, 4 bytes

Braingolf, 4 bytes

Explanation:

C, 20 bytes

Lua, 18 bytes

09D, 13 bytes

Explanation:

Java, 41 36 12 bytes

Triangular, 6 bytes

Decimal, 13 bytes

dc, 12 9 bytes

Add++, 3 bytes

Triangularity, 17 bytes

Triangularity, 17 bytes

Noether, 4 bytes

Cubically, 8 5 bytes

Whitespace, 60 bytes

Python 2 - 15 bytes

TI-Basic, 3 bytes

PowerShell, 36 20 bytes

Keg, 3 bytes(SBCS on Keg wiki)

Explanation:

x86_64 machine language on Linux, 8 bytes

><>, 3 bytes

Clam, 5 4 bytes

Explanation

C, 19 bytes

C, 18 bytes

Caboose, 24 bytes

1+, 10 bytes

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