Get delta of days by current hour and added delta of days

Question

Inputs:

current hour: from 0 to 23 (inclusive)
delta of hours: [current hour] + [delta of hours] = withing the range of Integer

Output:

delta of days: the value which shows difference in days between day of current hour and day of sum [current hour] + [delta of hours]

Scoring

Answers will be scored in bytes with fewer bytes being better.

Examples:

[current hour] = 23; [delta of hours] = -23; delta of days = 0
[current hour] = 23; [delta of hours] = 1; delta of days = 1
[current hour] = 23; [delta of hours] = 24; delta of days = 1
[current hour] = 23; [delta of hours] = 25; delta of days = 2
[current hour] = 23; [delta of hours] = -24; delta of days = -1
[current hour] = 23; [delta of hours] = -47; delta of days = -1

Welcome to CGCC! The code-challenge tag is reserved for custom winning criteria. Did you mean code-golf? — Arnauld, Jul 26, 2019 at 9:39
Welcome to the site! I am going to have to disagree with Arnauld and suggest that a description of the winning criterion is present in the body of the challenge. Here is a good summary of why I think this which seems to have the approval of our community. I've gone ahead and edited a winning criterion into your challenge based on my best guess feel free to change it. — Wheat Wizard, Jul 26, 2019 at 11:38

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

JavaScript (ES6), 26 25 bytes

Takes input as (current)(delta).

a=>b=>(a+b-(a<-b)*2)/3>>3

Try it online!

Commented

a =>                // a = current hour
b =>                // b = delta of hours
  (                 //
    a + b           // 1) we compute the sum
    - (a < -b) * 2  //    and we subtract 2 if this sum is negative
                    //    examples:
                    //      51 remains 51
                    //      23 remains 23
                    //      -1 is turned into -3
  ) / 3             // 2) float division by 3
                    //    examples:
                    //      51 is turned into 17
                    //      23 is turned into 7.666…
                    //      -3 is turned back into -1
  >> 3              // 3) right arithmetic shift by 3 on the integer part
                    //    examples:
                    //      17 becomes 2
                    //      7.666… becomes 0
                    //      -1 is unchanged

JavaScript (ES6), 26 bytes

More straightforward, but less fun and 1 byte longer anyway.

Takes input as (current)(delta).

a=>b=>Math.floor((a+b)/24)

Try it online!

Adám · Accepted Answer · 2019-07-26 11:18:12Z

6

Jelly, 4 bytes

+:24

Try it online!

+ add the arguments

:24 integer divide by 24

answered Jul 26, 2019 at 11:18

Adám

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Adám · Accepted Answer · 2019-07-26 10:27:03Z

4

APL (Dyalog Unicode), 6 bytes^SBCS

Anonymous tacit infix function, taking current and delta as arguments.

⌊24÷⍨+

Try it online!

+ add the arguments

24÷⍨ divide that by 24

⌊ floor

answered Jul 26, 2019 at 10:27

Adám

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

4

05AB1E (legacy), 4 bytes

+24÷

Try it online or verify all test cases.

05AB1E, 11 5 bytes

+24/ï

-6 bytes by porting @Adam's approach in his APL answer.

Try it online or verify all test cases.

Explanation:

+      # Sum the two (implicit) input-integers together
 24÷   # Integer-divide this sum by 24
       # (after which the result is output implicitly)

+      # Sum the two (implicit) input-integers together
 24/   # Divide this sum by 24
    ï  # Floor
       # (after which the result is output implicitly)

The legacy version of 05AB1E uses a Python compiler. When integer-dividing, it will always floor the integer, whether the integer it divides is positive or negative.

The new version of 05AB1E uses an Elixir compiler. When integer-dividing in the new version of 05AB1E, it will round towards 0 (so basically truncates the decimal digits after dividing). So this will floor for positive integers, but ceil for negative integers.

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Jul 26, 2019 at 10:22

Kevin Cruijssen

105k8 gold badges128 silver badges344 bronze badges

1

\$\begingroup\$ 5 bytes? \$\endgroup\$
– Expired Data
Jul 26, 2019 at 10:41
\$\begingroup\$ @ExpiredData Ah, noticed your comment after Adam's answer. But you're indeed right this can be done much easier.. Maybe I should just delete my answer out of shame and let you get the 5-byter. ;) \$\endgroup\$
– Kevin Cruijssen
Jul 26, 2019 at 10:52
\$\begingroup\$ nah I'm sure you'll pay me back in bytes saved given how terrible me 05AB1E is at the moment so don't worry! \$\endgroup\$
– Expired Data
Jul 26, 2019 at 10:53
\$\begingroup\$ @Adám That's what I initially had in mind when I saw the challenge, but it doesn't work for the [23,-24] and [23,-48] test cases. Which is why I had that weird 11 byter as my initial answer. Integer division will ceil for negative integers, instead of floor. \$\endgroup\$
– Kevin Cruijssen
Jul 26, 2019 at 11:29
\$\begingroup\$ Ah, so it rounds towards 0. Fair enough. \$\endgroup\$
– Adám
Jul 26, 2019 at 11:32

| Show 1 more comment

movatica · Accepted Answer · 2019-07-26 15:37:59Z

4

Python 3, 20 19 bytes

Simple lambda:

lambda*a:sum(a)//24

-1 byte thanx to Jonathan Allan

Try it online!

Full program for 38 bytes:

print((int(input())+int(input()))//24)

edited Jul 26, 2019 at 15:37

answered Jul 26, 2019 at 12:11

movatica

8754 silver badges6 bronze badges

1

\$\begingroup\$ Save a byte with *args like so: lambda*a:sum(a)//24. Switch to Python 2 and save another with lambda*a:sum(a)/24. \$\endgroup\$
– Jonathan Allan
Jul 26, 2019 at 15:18

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Robert S. · Accepted Answer · 2019-07-26 20:20:33Z

3

R, 28 16 bytes

Just a port of most of the other answers...
-12 bytes thanks Giuseppe

sum(scan())%/%24

Try it online!

edited Jul 26, 2019 at 20:20

answered Jul 26, 2019 at 20:14

Robert S.

1,3138 silver badges17 bronze badges

\$\begingroup\$ Use x%/%y instead of floor(x/y) \$\endgroup\$
– Giuseppe
Jul 26, 2019 at 20:16
1

\$\begingroup\$ Or better yet, take input from stdin and do sum(scan())%/%24 \$\endgroup\$
– Giuseppe
Jul 26, 2019 at 20:18
\$\begingroup\$ Nice one. Will have to remember that trick. \$\endgroup\$
– Robert S.
Jul 26, 2019 at 20:21

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Rin's Fourier transform · Accepted Answer · 2019-07-30 18:31:58Z

Haskell, 18 16 bytes

((`div`24).).(+)

Try it online!

If taking input as a list is allowed, this can be done in 13 bytes (thanks cole):

(`div`24).sum

Try it online!

I've seen people leave off the function declaration in the byte count for pointfree style, so I'm doing the same here.

Explanation:

(`div`24)

div is the shorter integer division operator. Haskell has this nice syntactic sugar where you can curry infixes by putting the argument on its respective side of the infix (thanks mimi), so this is a function that does integer division by 24.

The double composition is a little weird to explain, so I'll follow the template of this great SO answer:

f a b = (`div`24) (a + b)       -- what we want
f a b = (`div`24) ((+) a b)     -- un-infixing (+)
f a b = ((`div`24) . ((+) a)) b -- definition of function composition (partially applying (+) onto a)
f a = ((`div`24) . ((+) a)       -- pointfree reduction
f a = ((`div`24) .) ((+) a)     -- associative property
f a = (((`div`24) .) . (+)) a   -- definition of function composition
f = ((`div`24).) . (+)            -- pointfree reduction

When this takes a list as input, the sum function only has one argument, so the extra composition isn't needed (since we don't have to do that extra curry).

if you can take input as an array, then (`div`24).sum is shorter — cole, Jul 28, 2019 at 6:04

Cinaski · Accepted Answer · 2019-07-26 12:04:30Z

2

Ohm v2, 4 bytes

+24v

Try it online!

answered Jul 26, 2019 at 12:04

Cinaski

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Gymhgy · Accepted Answer · 2019-07-26 13:08:02Z

1

C# (Visual C# Interactive Compiler), 26 bytes

a=>b=>Math.Floor((a+b)/24)

Try it online!

answered Jul 26, 2019 at 13:08

Gymhgy

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Jo King · Accepted Answer · 2019-07-28 11:16:13Z

1

Perl 6, 11 bytes

(*+*)div 24

Try it online!

Anonymous Whatever lambda that takes two arguments and returns the sum of the two integer divided by 24

answered Jul 28, 2019 at 11:16

Jo King♦

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val is still with Monica · Accepted Answer · 2019-07-29 14:32:26Z

1

Lua, 32 26 bytes

print((arg[1]+arg[2])//24)

Try it online!

Rather boring solution. Take input as arguments, print to stdout. Require Lua 5.3 or greater.

Old solution: Lua, 32 bytes

function(a,b)return(a+b)//24 end

Try it online!

Same idea, but implemented as function instead of full program.

edited Jul 29, 2019 at 14:32

answered Jul 28, 2019 at 9:34

val is still with Monica

5974 silver badges11 bronze badges

\$\begingroup\$ Nice. Thought briefly about a function, but didn't take the time. \$\endgroup\$
– ouflak
Jul 29, 2019 at 20:45
\$\begingroup\$ @ouflak New solution is full program taking input as command like arguments tho. \$\endgroup\$
– val is still with Monica
Jul 29, 2019 at 20:56

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ouflak · Accepted Answer · 2019-07-29 20:43:44Z

1

Lua, 70 50 bytes

c,d=io.read():match("(%S+) (%S+)")print((c+d)//24)

-20 bytes thanks to val

Try it online!

edited Jul 29, 2019 at 20:43

answered Jul 26, 2019 at 12:06

ouflak

1,8912 gold badges13 silver badges26 bronze badges

\$\begingroup\$ Second line can be made shorter by specifying valid input format. Third line is just print((c+d)//24) in Lua 5.3. There are also some other ways to golf this. \$\endgroup\$
– val is still with Monica
Jul 28, 2019 at 9:36
\$\begingroup\$ Mind if I'll edit and improve your answer later today? Mine is shorter, but your is full program. \$\endgroup\$
– val is still with Monica
Jul 28, 2019 at 9:37
\$\begingroup\$ @val, Just go ahead and post your solution with your own TIO. Or if you don't want to do that, just comment here your suggested improvement and I'll edit it giving credit. These options seem to be the way things work around here. \$\endgroup\$
– ouflak
Jul 28, 2019 at 21:46
\$\begingroup\$ 50 bytes: Try it online!. Use space separated input. I'll also add another solution which take arguments from command line to my answer. \$\endgroup\$
– val is still with Monica
Jul 29, 2019 at 14:25

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LegionMammal978 · Accepted Answer · 2020-10-31 21:44:53Z

1

Husk, 4 bytes

÷24+

Try it online! Nothing very original here.

answered Oct 31, 2020 at 21:44

LegionMammal978

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Adám · Accepted Answer · 2019-07-26 14:57:53Z

0

I, 6 bytes

Anonymous tacit infix function, taking current and delta as arguments.

+/24.m

Try it online!

Beginning with:

+ the sum of the arguments

/ divide by:

24 twentyfour

. apply:

m floor (minimum)

answered Jul 26, 2019 at 14:57

Adám

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Neil · Accepted Answer · 2019-07-26 23:51:28Z

Retina 0.8.2, 41 bytes

\d+,?
$*
(1+)-\1
-
^((-)1|1{24})*.*
$2$#1

Try it online! Link includes test suite. Explanation:

\d+,?
$*

Convert both inputs to unary and take the sum if the second input is positive.

(1+)-\1
-

But if the second input is negative then take the difference.

^((-)1|1{24})*.*
$2$#1

Floor divide the input by 24 and convert to decimal. For positive numbers the first alternation never matches so this just counts the number of whole multiples of 24 in the number. For negative numbers the leading -1 counts as an extra negative multiple of 24 in addition to any remaining multiples of 24, thus achieving the desired floor division.

U12-Forward · Accepted Answer · 2019-07-28 04:50:06Z

0

Python 2, 18 bytes

lambda*a:sum(a)/24

Try it online!

answered Jul 28, 2019 at 4:50

U12-Forward

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

0

Perl 5 (`-MPOSIX=floor -MList::Util=sum -alp`), 19 bytes

$_=floor+(sum@F)/24

TIO

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Jul 29, 2019 at 9:46

Nahuel Fouilleul

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

Whitespace, 49 bytes

[S S S N
_Push_0][S N
S _Duplicate_0][T   N
T   T   _Read_STDIN_as_integer][T   T   T   _Retrieve_input][S S S N
_Push_0][S N
S _Duplicate_0][T   N
T   T   _Read_STDIN_as_integer][T   T   T   _Retrieve_input][T  S S S _Add][S S S T T   S S S N
_Push_24][T S T S _integer_division][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).

Explanation in pseudo-code:

Integer a = STDIN as integer
Integer b = STDIN as integer
a = a + b
a = a integer-divided by 24
Print a as integer to STDOUT

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

0

Forth (gforth), 12 bytes

: f + 24 / ;

Try it online!

Code Explanation

: f           \ start a new word definition
  +           \ add current hour and delta
  24 /        \ (integer) divide result by 24, round towards negative infinity
;             \ end word definition

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Jul 29, 2019 at 17:05

reffu

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640KB · Accepted Answer · 2019-07-29 18:28:21Z

0

PHP, 29 bytes

<?=floor((date(G)+$argn)/24);

Try it online!

Full program, with current hour being the current hour on the platform host, and delta of hours input via STDIN.

Or

PHP, 30 bytes

<?=floor(array_sum($argv)/24);

Try it online!

Input of current hour and delta of hours via command line.

edited Jul 29, 2019 at 18:28

answered Jul 29, 2019 at 18:18

640KB

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Get delta of days by current hour and added delta of days

20 Answers 20

JavaScript (ES6), 26 25 bytes

Commented

JavaScript (ES6), 26 bytes

Jelly, 4 bytes

APL (Dyalog Unicode), 6 bytes^SBCS

05AB1E (legacy), 4 bytes

05AB1E, 11 5 bytes

Python 3, 20 19 bytes

R, 28 16 bytes

Haskell, 18 16 bytes

Ohm v2, 4 bytes

C# (Visual C# Interactive Compiler), 26 bytes

Perl 6, 11 bytes

Lua, 32 26 bytes

Old solution: Lua, 32 bytes

Lua, 70 50 bytes

Husk, 4 bytes

I, 6 bytes

Retina 0.8.2, 41 bytes

Python 2, 18 bytes

Perl 5 (`-MPOSIX=floor -MList::Util=sum -alp`), 19 bytes

Whitespace, 49 bytes

Forth (gforth), 12 bytes

Code Explanation

PHP, 29 bytes

PHP, 30 bytes

Your Answer

Not the answer you're looking for? Browse other questions tagged code-golf date or ask your own question.

Hot Network Questions

Get delta of days by current hour and added delta of days

20 Answers 20

JavaScript (ES6), 26 25 bytes

Commented

JavaScript (ES6), 26 bytes

Jelly, 4 bytes

APL (Dyalog Unicode), 6 bytesSBCS

05AB1E (legacy), 4 bytes

05AB1E, 11 5 bytes

Python 3, 20 19 bytes

R, 28 16 bytes

Haskell, 18 16 bytes

Ohm v2, 4 bytes

C# (Visual C# Interactive Compiler), 26 bytes

Perl 6, 11 bytes

Lua, 32 26 bytes

Old solution: Lua, 32 bytes

Lua, 70 50 bytes

Husk, 4 bytes

I, 6 bytes

Retina 0.8.2, 41 bytes

Python 2, 18 bytes

Perl 5 (-MPOSIX=floor -MList::Util=sum -alp), 19 bytes

Whitespace, 49 bytes

Forth (gforth), 12 bytes

Code Explanation

PHP, 29 bytes

PHP, 30 bytes

Your Answer

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Not the answer you're looking for? Browse other questions tagged code-golf date or ask your own question.

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Hot Network Questions

APL (Dyalog Unicode), 6 bytes^SBCS

Perl 5 (`-MPOSIX=floor -MList::Util=sum -alp`), 19 bytes